High leverage locking-type pliers incorporating a four bar linkage system adapted to amplify force applied by the user to an object gripped between jaws of the pliers. The pliers include first and second handles, first and second jaws, and a center link rotatably or pivotally coupled to the first and second handles. A first link pivot where the center link rotatably or pivotally couples to the second handle may be a first distance L1 away from a second jaw pivot where the second jaw rotatably or pivotally couples the second handle. A first jaw pivot where the second jaw rotatably or pivotally couples the first handle is a second distance L2 away from the second jaw pivot. In an embodiment, the first distance L1 is about 34% to about 70% of the second distance L2.

A pair of stamping pliers for stamping and bonding includes a first handle, a second handle and a stamping nail. The first handle and the second handle are staggered, pivotally connected, and rotated with respect to each other, and the first handle has a stamping seat which is a stamping groove and a guide through hole provided for moving the stamping nail axially. The second handle has a linking portion linkable to the stamping nail, so that when the second handle is rotated relative to the first handle, the linking portion can be linked to the stamping nail to move the stamping nail axially in the guide through hole.

A pair of stamping pliers for stamping and bonding includes a first handle, a second handle and a stamping nail. The first handle and the second handle are staggered, pivotally connected, and rotated with respect to each other, and the first handle has a stamping seat which is a stamping groove and a guide through hole provided for moving the stamping nail axially. The second handle has a linking portion linkable to the stamping nail, so that when the second handle is rotated relative to the first handle, the linking portion can be linked to the stamping nail to move the stamping nail axially in the guide through hole.

Pliers for tightening parts for levelling cladding tiles, including: a first arm (1) with a handle (10) and a guide bar (11); a second arm (2) with a handle (20) and a contact surface (21) with a levelling wedge; a rotation shaft (4); and a supporting stop (3) comprising: a passage (31) for assembly in the guide bar; a shaft (32) assembled in a longitudinal slot (12) of the guide bar for the longitudinal movement of the supporting stop (3) with respect to the guide bar (11) and the relative rotation thereof between a fastening position with a pawl (13, 34) and a longitudinal movement position of the supporting stop (3) with respect to said guide bar (11); and a spring (33) which tends to maintain the supporting stop (3) in the fastening position with respect to the guide bar (11).

A pliers includes two main bodies pivotally coupled to one another. A first main body defines a first pivot hole and a second main body defines a second pivot hole respectively. The first pivot hole has a first inner peripheral section with a flaring conical shape. Furthermore, the first pivot hole has a second inner peripheral section with a flaring conical shape. The first inner peripheral section has a first cone angle and the second inner peripheral section has a second cone angle respectively. The second cone angle is smaller than the first cone angle. The first and the second main bodies are pivotally interconnected with a fastener. The fastener has a first outer peripheral section abutting and conforming to the first inner peripheral section and a second outer peripheral section abutting and conforming to the second inner peripheral section respectively.

A pliers includes two main bodies pivotally coupled to one another. A first main body defines a first pivot hole and a second main body defines a second pivot hole respectively. The first pivot hole has a first inner peripheral section with a flaring conical shape. Furthermore, the first pivot hole has a second inner peripheral section with a flaring conical shape. The first inner peripheral section has a first cone angle and the second inner peripheral section has a second cone angle respectively. The second cone angle is smaller than the first cone angle. The first and the second main bodies are pivotally interconnected with a fastener. The fastener has a first outer peripheral section abutting and conforming to the first inner peripheral section and a second outer peripheral section abutting and conforming to the second inner peripheral section respectively.

Cutting pliers include a first plier body and a second plier body. The first plier body includes a support end and a first handle coupled to each other. The second plier body includes a cutting end and a second handle coupled to each other. The first handle and the second handle are rotationally coupled by a connecting shaft. The support end and the cutting end cooperatively form jaws for cutting a pipe. The support end comprises a convex arcuate surface for supporting a pipe. The cutting end comprises two clamping arms and a blade. The blade is arranged between the two clamping arms. When the jaws are closed, a clamping end of the clamping arms abuts against the pipe, the pipe on the arcuate support surface is squeezed and deformed along the arcuate support surface to form an arcuate pipe, and the blade abuts against the arcuate pipe.

Cutting pliers include a first plier body and a second plier body. The first plier body includes a support end and a first handle coupled to each other. The second plier body includes a cutting end and a second handle coupled to each other. The first handle and the second handle are rotationally coupled by a connecting shaft. The support end and the cutting end cooperatively form jaws for cutting a pipe. The support end comprises a convex arcuate surface for supporting a pipe. The cutting end comprises two clamping arms and a blade. The blade is arranged between the two clamping arms. When the jaws are closed, a clamping end of the clamping arms abuts against the pipe, the pipe on the arcuate support surface is squeezed and deformed along the arcuate support surface to form an arcuate pipe, and the blade abuts against the arcuate pipe.

A hand tool structure has two plier bodies pivoted by a pivot member, and a knob mechanism for controlling opening and closing of the two plier bodies. Opposing sides of the two plier bodies each include a V-shaped groove to form a square clamping hole when the two plier bodies are closed; a row of teeth; a first cutting portion for cutting an electric wire or cable; a second cutting portion for cutting a metal wire; a wavy peeling portion having curved sections, wherein when the two plier bodies are closed, the curved sections form receiving holes with different diameters. The two plier bodies have first and second cutting holes for cutting screws. The first cutting hole includes a large diameter section and a small diameter section. The second cutting hole is greater than the large diameter section, and its extending direction is inclined relative to the first cutting hole.

A hand tool structure has two plier bodies pivoted by a pivot member, and a knob mechanism for controlling opening and closing of the two plier bodies. Opposing sides of the two plier bodies each include a V-shaped groove to form a square clamping hole when the two plier bodies are closed; a row of teeth; a first cutting portion for cutting an electric wire or cable; a second cutting portion for cutting a metal wire; a wavy peeling portion having curved sections, wherein when the two plier bodies are closed, the curved sections form receiving holes with different diameters. The two plier bodies have first and second cutting holes for cutting screws. The first cutting hole includes a large diameter section and a small diameter section. The second cutting hole is greater than the large diameter section, and its extending direction is inclined relative to the first cutting hole.