Check the listing for details. Hex Bit Socket H17 1/2" Drive 4" Length S2 Steel Long Bit CR-V Socket. Condition: New. Listed at 21.65 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 hex 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.