The heart of the Chapman Tools is the precision ratchet, part No. CHAP.CM-13. This high quality, miniature tool with a twenty tooth ratchet is made of stainless steel. It far exceeds the torque standards set by Military Specifications. Having a short 18 degree working arc, it is unbeatable for working in close quarters (ratchet dimensions shown below). Dependable and fast acting (easy one handed in and out adapter changes), it easily drives Slotted, Square, Phillips, Allen Hex type, Reed and Prince, Bristol (6-flute multi-spline) and TORX fasteners. Used with the 1/4" square drive adapter, it also accommodates 1/4" square drive sockets. Reverse action is obtained by simply tuning the ratchet over. Complimenting the ratchet is the stackable extension and screwdriver handle.