Check the listing for details. 12 Point Metric Sized M18 1/2" Drive Triple Square Spline Bit Socket Set. Condition: New. Listed at 23.05 USD. The screwdriver bits are made of specially heat-treated S2 steel, and the socket adapter are made of high-strength chromium vanadium steel (CR-V) with strong torque, which both feature high strength, durability, wear resistance and corrosion resistance.Designed with a chamfered drive end, the triple square spline bit socket allows for smooth insertion, protecting both the bit and fasteners from edge damage and stripping. Simply attach it to a compatible ratchet or extension and easily tighten or loosen slotted drive fasteners.The socket adapter and drill bit is used to remove and tighten bolts and nuts, which are widely used in automobile maintenance, mechanical equipment repair, construction, carpentry, home repair, etc. and can be used with electric hand drill, electric wrench, air screwdriver and ratchet wrench.