Cross slit screwdriver bit, has fins with middle parts separated by given distances and fin tips with given widths

摘要

The distance between the middle parts (26) of the fins (23) is 6.65-7.35 mm. Each fin has a tip (27) with a width of 1.8-2.1 mm. The bit head (21) has four grooves (22) which define four fins, each with a middle part and a tip. A slanting surface (24) on the fin is tapered from the middle part towards the tip.