Carbon Steel forged from high-quality chrome steel in an advanced heat treatment process. Black-oxide finish on long arm tools, which maximizes the service life of the product. High-visibility sizes marked on each wrench and a sturdy carrying case for fast size selection. Greater torque - medium and long-sized wrenches increase torque and range of use. Burr free chamfered ends precisely-sized. Chamfered ends are burr free to insert smoothly into fastener head, reducing wear. Wide application 30Pcs hex key set covers all screws in both metric and inch, suitable for installing towel bars, repairing bicycles and assembling furniture., Weight: 1.6314207388 pounds, Manufacturer: Not Known