PREMIUM - 13-Piece set, Featured a wide range of Torx Tamper Proof Bit Socket. Crafted and Designed with superior materials for increased torque and unmatched hardness. DURABLE - Drop-forged, Heat-treated S2 alloy steel bits, Reduce wear-outs. Hardened treated Chrome Vanadium steel sockets, Increase turning power. LONGEVITY - Complete rust and corrosion resistance with fully polished, Chrome plated mirror finish sockets and Zinc Phosphate bits treatment. COMFORTABLE - Insert smoothly with precision chamfered bit ends. Sizes are stamped on sockets and on heavy duty storage case for faster recognition. 100% RISK-FREE – Meet & Exceeds ANSI (The American National Standard Institute) and backed by our Lifetime Limited Warranty for your complete peace of mind.