A vehicle O.sub.2 sensor wrench attachment is made integral with a safety latch for an air hammer rod. The safety latch comprises a jaw assembly that has a swivel tooth that is manually moved from an open position to allow insertion of the air hammer rod into the mouth. For a working mode using the air hammer to hit the jaw assembly, the tooth is moved to a locked mode. A ball and spring assembly ensures the air hammer rod, having a transverse rod, stays in the locked mode during operation.

A vehicle O.sub.2 sensor wrench attachment is made integral with a safety latch for an air hammer rod. The safety latch comprises a jaw assembly that has a swivel tooth that is manually moved from an open position to allow insertion of the air hammer rod into the mouth. For a working mode using the air hammer to hit the jaw assembly, the tooth is moved to a locked mode. A ball and spring assembly ensures the air hammer rod, having a transverse rod, stays in the locked mode during operation.

A wrench has a driving head segment defining a portion of a receiving space of the wrench and including a first driving side of the wrench. The driving side includes a plurality of driving sections for abutting against the object. The plurality of driving sections includes surfaces aligned along an axis. The driving side includes a plurality of first recesses disposed alternatively among the plurality of first driving sections.

A release wrench for a tie down ratchet strap, having an elongated body with a first wrench end positioned at a first end of the elongated body, and a second wrench end positioned at a second end of the elongated body. Each of the first and second wrench ends are notched such that either end can be inserted into the rotating ratchet of a tie down ratchet strap such that rotation of the release wrench causes the rotating ratchet to move. The first wrench end extends in a direction perpendicular to the elongated body of the release wrench, and the second wrench end extends in a direction parallel to the elongated body of the release wrench. As a result, the wrench can be positioned at four different (i.e.: 90 degrees apart) positions when the release wrench is first turned to cause the rotating tie down ratchet to move. This provides a simple and effective way to “un-stick” a dirty ratchet by prying it loose. Since the release wrench can conveniently be positioned initially in one of four different orientations, the wrench can be operated in conditions where there is little clearance for hands or tools, such as underneath or around vehicle trailers or cargo containers.

A release wrench for a tie down ratchet strap, having an elongated body with a first wrench end positioned at a first end of the elongated body, and a second wrench end positioned at a second end of the elongated body. Each of the first and second wrench ends are notched such that either end can be inserted into the rotating ratchet of a tie down ratchet strap such that rotation of the release wrench causes the rotating ratchet to move. The first wrench end extends in a direction perpendicular to the elongated body of the release wrench, and the second wrench end extends in a direction parallel to the elongated body of the release wrench. As a result, the wrench can be positioned at four different (i.e.: 90 degrees apart) positions when the release wrench is first turned to cause the rotating tie down ratchet to move. This provides a simple and effective way to “un-stick” a dirty ratchet by prying it loose. Since the release wrench can conveniently be positioned initially in one of four different orientations, the wrench can be operated in conditions where there is little clearance for hands or tools, such as underneath or around vehicle trailers or cargo containers.

A fan clutch wrench is provided, including a rod and a driving member. The driving member includes a longitudinal direction and a thickness direction, two opposite ends of the driving member on the longitudinal direction are respectively defined as a first end and a second end, the second end is rotatably connected to the rod, an engagement hole penetrates through the first end in the thickness direction, the engagement hole penetrates through the first end to form a first lateral opening along a direction which is lateral to the thickness direction and lateral to the longitudinal direction, and the first lateral opening is for a fastener of a fan clutch to pass therethrough to be engaged with the engagement hole.

A wrench for rotating a hex head fastener has a frame having one or two jaw faces. If the frame has two faces, they form a 60 degree angle between them. A movable jaw has two faces forming an angle of about 120 degrees relative to each other. A guide connected to the frame controls movement of the movable jaw along a line forming an angle of about 40.9 degrees with respect to a position of one of the frame faces.

A reduced arc box end ratchet wrench or ratchet drive wrench utilizes a multiple pawl ratchet assembly comprised of a body having an insert cavity to enclose critical components of an insert that is secured within the ratchet assembly. The insert is set into the wrench body and includes a plurality of pivoting pawls. Each pawl comprises a lever arm with ratchet engaging teeth. The pawl arms are positioned relative to the ratchet wheel to create “pawl swing arcs” and “reduced ratcheting arcs” to alternately or successively engage a portion of the teeth of a ratchet wheel at all times. This configuration allows smaller degrees between ratchet teeth and a smaller wrench rotation that is otherwise required to apply torque.

A reduced arc box end ratchet wrench or ratchet drive wrench utilizes a multiple pawl ratchet assembly comprised of a body having an insert cavity to enclose critical components of an insert that is secured within the ratchet assembly. The insert is set into the wrench body and includes a plurality of pivoting pawls. Each pawl comprises a lever arm with ratchet engaging teeth. The pawl arms are positioned relative to the ratchet wheel to create “pawl swing arcs” and “reduced ratcheting arcs” to alternately or successively engage a portion of the teeth of a ratchet wheel at all times. This configuration allows smaller degrees between ratchet teeth and a smaller wrench rotation that is otherwise required to apply torque.

A hand tool for servicing a power tool or other host tool is adapted to be readily mountable to and dismountable from the host tool via magnetic coupling. The hand tool includes a handle body, and a nut driver supported on the handle body. The handle body may define a bifurcated support, and the tool may include a pivot pin extending through the bifurcated support and the nut driver to support the nut driver on the tool. The nut driver defines at least one socket region dimensioned to receive a nut, and further is magnetized for magnetic coupling with a nut positioned within the socket region. In one embodiment, the nut driver houses a discrete magnet for this purpose. A second magnet may be supported on the handle body toward its central portion.