The screwdriver bits are made of S2 steel with heat treatment, HRC52-55, good toughness and wear resistanceStrong magnetic, good workmanship, high precision. each edge can be accurately locked screws, no damage to the screw and the screwdriver headWith 1/4 inch hex shaft, they are widely used on electric screwdrivers, hand screwdrivers, cordless drills, etcThe screwdriver bits are 150mm /6" long, suit for poket hole jig woodworking.Fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth Package Includes: 1 x SQ1 Square Screwdriver Bits 1 x SQ2 Square Screwdriver Bits 1 x SQ2.5 Square Screwdriver Bits 1 x SQ2.7 Square Screwdriver Bits 1 x SQ3 Square Screwdriver Bits 1 x SQ4 Square Screwdriver Bits 1 x SQ5 Square Screwdriver Bits
