A flex joint headed tool with a locking mechanism adapted to selectively retain the angle of the head relative to a handle. The locking mechanism may retain the head in at least one of two positions using a bias member and two detent balls disposed at opposite ends of the bias member. The bias member and detent balls may be disposed in a through hole disposed in a locking lever, with one detent ball engaging a joint tang and the other detent ball engaging a detent disposed in a tool body or handle, wherein the detent balls provide tactile response to a user. The locking lever may rotate between locked and unlocked positions, whereby in the locked position, the ratchet head is prevented from rotating relative to the handle, and when in the unlocked position, the head may rotate relative to the handle.

A ratchet wrench assembly includes a ratchet installed in a through hole of a head. The ratchet includes a through hole, an annular groove and a side opening. The through hole communicates with the annular groove via the side opening. One of two open ends of the through hole is a star-shaped opening with twelve points. Another one of the two open ends of the through hole is a hexagonal opening with six points. A C-clip is secured in the annular groove. A part of the C-clip located at the side opening is located inside the through hole. A working component has a hexagonal cross section and is inserted from the star-shaped opening end. When the working component matches with the hexagonal opening, it is movable through the through hole. When the working component is not matched with the hexagonal opening, the rod part cannot pass through the through hole.

A fastening assembly may include a fastener having a threaded portion defined around a longitudinal axis, a drive portion, and a bypass portion. A fastening assembly may include a lever arm that is moveable along the longitudinal axis between a first state, in which the lever arm is interfaced with the drive portion, and a second state, in which the lever arm is interfaced with the bypass portion, wherein the lever arm is operable to rotate the fastener in the first state and operable to rotate relative to the fastener in the second state.

A sleeve includes a plugging structure, a stopping structure and a driven structure. The plugging structure includes a plugging body, a plugging hole and at least one inclined tapering groove. An end of the plugging body has a plugging hole periphery. The plugging hole is extended through the plugging body. The at least one inclined tapering groove is disposed to the plugging body. The stopping structure is disposed to the other end of the plugging body. The driven structure is disposed to an end of the stopping structure. The at least one inclined tapering groove is extended from the plugging hole periphery to the stopping structure. The plugging hole is a square hole, and the plugging body has four corners, each of the four corners has a plugging groove, the plugging groove is extended from the plugging hole periphery to the stopping structure.

A wrench structure includes a first body, a second body, a first connecting member, and two pivot members. The first body is provided with a first pivot portion, two first recesses, and a first through hole. The second body is provided with a second pivot portion, a second recess, and a second through hole. The first connecting member is pivotally connected between the first body and the second body and has a first end provided with a third pivot portion, a third recess, and a third through hole and a second end provided with a fourth pivot portion, two fourth recesses, and a fourth through hole. One of the pivot members extends through the third through hole and the first through hole, and the other one the pivot members extends through the second through hole and the fourth through hole.