LEXIVON Master Wrench Key Set, 35-Piece Long Arm Ball End Hex Keys | 3-Pack Metric/SAE & Star, Industrial Grade S2 Alloy Steel (LX-131)PREMIUM Precisely machined HEX & Torx sizes. Crafted and Designed with superior materials for increased torque and unmatched hardness. DURABLE Industrial grade, heat treated S2 alloy steel will increase turning power. Heavy duty, will outperform the regular cr v or common carbon materials. LONGEVITY Manganese Phosphate coating for rust and corrosion protection. Plus, the chamfered edges and ball end design will provide up to 25 degree angle entry.