Please check the images for damage sustained during use. 1/4" (6.35mm) drive, ultra-compact head (thickness 17.1mm, width 20.5mm). When combined with slim Z-EAL sockets, the extremely thin profile allows for use in tight spaces. New 36-tooth gear ratchet handle. Ko-ken's ratchet handles are characterized by their "light idling torque," and this model features a specially developed ratchet mechanism. It achieves overwhelmingly light idling compared to the ratchet mechanisms commonly found in the market, which use a single-piece pawl to push up the gear. The idling torque is on par with the conventional two-pawl system. This is the ideal ratchet handle according to Ko-ken. Thank you for viewing.