steel and strength, sturdy, bright plating, and black two-color handle, opposite side size 6.35-22.2mm/0.25-0.87in, jaw, wheel spine 40Cr, 50CRv, for metric 6-22, inImperial 1/4--7/8 screw, gear, Key components steel, automatic machining, heat process, environmental materials. sleeve hanging protect the socket head from wearing and falling into the maintenance space,quick release mechanism, quick stripping function, anti-rust, wear,overall hardening. Suitable for production lines, repairing shop, factory, shop, car modification, Manufacturer: Fcnjsao