3/8 in. Drive MM Hex Bit Socket Set. Professionals like you know time can be wasted trying to remove worn fasteners. Be prepared for those situations with this set, which is designed to help you quickly loosen rounded fasteners and prevent the rounding and stripping of new fasteners. Engineered to help you get more work done over time without needing to replace sockets, they feature a full-polish chrome finish for long-term corrosion resistance.