A screwdriver for driving a screw in bone includes a first body configured to engage a tulip of the screw, a first central bore extending through the first body, a second body having a second central bore extending through the second body and an external surface having a spline member positioned at least partially within the cavity, an inner shaft configured to drive a screw into bone and being rotatably coupled with the second body, a spring-biased pawl engageable with the spline member of the second body, a collar rotatable relative to the first body and the second body and having a cammed inner surface, when the collar is rotated in a first direction about the first body, the cammed inner surface pushes the spring-biased pawl into engagement with the spline member to rotatably couple the first body and the second body.

A ratchet screwdriver includes a mounting seat, a fixing ring, a control member, a driving shaft, two pawls, two springs, a fixing ring, a control member, a bead, a positioning spring and a bolt. The mounting seat has a front with a first slot, a second slot, a first extension slot, a second extension slot, a passage, a first hole and a second hole. The driving shaft has a ratchet portion. Each pawl is biased by one spring so as to be engaged with the ratchet portion. The control member is rotatably mounted to the mounting seat and the driving shaft to pivot the pawls to engage or disengage with the ratchet portion.

A ratchet screwdriver includes a mounting seat, a fixing ring, a control member, a driving shaft, two pawls, two springs, a fixing ring, a control member, a bead, a positioning spring and a bolt. The mounting seat has a front with a first slot, a second slot, a first extension slot, a second extension slot, a passage, a first hole and a second hole. The driving shaft has a ratchet portion. Each pawl is biased by one spring so as to be engaged with the ratchet portion. The control member is rotatably mounted to the mounting seat and the driving shaft to pivot the pawls to engage or disengage with the ratchet portion.

A hand tool comprises a handle having a central area having a lower end and an upper end and a pair of outwardly extending arms at the upper end, and a shaft having a fixed end connected to the lower end of the central area and an open opposite end for receiving a tool bit. A ratchet mechanism is formed between the shaft and the central area to control rotational movement of the shaft. A ring is releasably mounted on the shaft and capable of limited movement relative to the shaft.

A hand tool comprises a handle having a central area having a lower end and an upper end and a pair of outwardly extending arms at the upper end, and a shaft having a fixed end connected to the lower end of the central area and an open opposite end for receiving a tool bit. A ratchet mechanism is formed between the shaft and the central area to control rotational movement of the shaft. A ring is releasably mounted on the shaft and capable of limited movement relative to the shaft.

A ratcheting driver can be configured to selectively transmit a torque to a fastener. The driver can include a handle, a geared body, and a shaft. The handle can include a housing, a pawl, and a biasing element. The housing can include a central bore and a shaft bore extending through a distal portion of the housing. The pawl can extend radially inward from the housing into the central bore. The biasing element can engage the housing. The geared body can be rotatably engageable with the pawl to allow rotation of the geared body relative to the handle in a first direction and to limit rotation of the geared body relative to the handle in a second direction, where the biasing element can be engageable with the geared body to bias the geared body distally.

A ratcheting driver can be configured to selectively transmit a torque to a fastener. The driver can include a handle, a geared body, and a shaft. The handle can include a housing, a pawl, and a biasing element. The housing can include a central bore and a shaft bore extending through a distal portion of the housing. The pawl can extend radially inward from the housing into the central bore. The biasing element can engage the housing. The geared body can be rotatably engageable with the pawl to allow rotation of the geared body relative to the handle in a first direction and to limit rotation of the geared body relative to the handle in a second direction, where the biasing element can be engageable with the geared body to bias the geared body distally.

A spiral ratchet driver with crank and slider mechanism comprises a spiral ratchet driver having a shank housing, a journal having a hole, connected to the shank housing by a screw, a ratchet mechanism assembly connected adjacent to the journal, a shank received in the shank housing and the ratchet mechanism assembly, a spindle having a spindle bearing connecting the second end of the shank to a chuck or a square drive, a lever connecting bar connected to the hole of the journal by means of a first rivet, a lever having a lever handle cushion grip, rotatably connected with the lever connecting bar, a handle bar having a handle bar grip on a free end, connected with the lever below the handle grip and connected with the spindle from a fixed end, a journal housing covering the journal, is connected with the handle bar and four or more bearing slides disposed between journal and the journal housing.

A spiral ratchet driver with crank and slider mechanism comprises a spiral ratchet driver having a shank housing, a journal having a hole, connected to the shank housing by a screw, a ratchet mechanism assembly connected adjacent to the journal, a shank received in the shank housing and the ratchet mechanism assembly, a spindle having a spindle bearing connecting the second end of the shank to a chuck or a square drive, a lever connecting bar connected to the hole of the journal by means of a first rivet, a lever having a lever handle cushion grip, rotatably connected with the lever connecting bar, a handle bar having a handle bar grip on a free end, connected with the lever below the handle grip and connected with the spindle from a fixed end, a journal housing covering the journal, is connected with the handle bar and four or more bearing slides disposed between journal and the journal housing.

A ratchet tool includes an insert engaged in a handle, and a shaft rotatably engaged through the insert, the shaft includes a non-circular hole for engaging with a tool bit, and a number of teeth formed on the shaft, a detent is engaged in the shaft and engageable with the tool bit, the insert includes a head having two or more pawls for engaging with the teeth of the shaft and for determining a driving direction of the shaft by the insert, a sleeve is rotatably engaged onto the shaft and engageable with the detent for forcing the detent to engage with the tool bit, and a control ferrule is engaged onto the shaft and the sleeve for moving the sleeve relative to the shaft.