Drop-forged one-piece Chrome Vanadium steel, specially hardened and tempered. Security TRX-Star* type head. Finished in black oxide for corrosion resistance. Supplied on two rails. Features & Benefits:Drop-forged one-piece Chrome Vanadium steel, specially hardened and tempered.Security TRX-Star* type head.Finished in black oxide for corrosion resistance.Contents: 1/4"Sq Drive; T10H, T15H, T20H, T25H, T27H, T30H, 3/8"Sq Drive; T40H, T45H, T47H, T50H, T55H, T60H, Minimum/Maximum Length; 25/40mm, 3/8"Sq(F) x 1/4"Sq(M) Adaptor.Supplied on two rails.Lifetime guarantee*.Model No. AK5585 Specifications: Model No AK5585 Brand: Premier Contents: 1/4"Sq Drive; T10H, T15H, T20H, T25H, T27H, T30H, 3/8"Sq Drive; T40H, T45H, T47H, T50H, T55H, T60H, 3/8"Sq(F) x 1/4"Sq(M) Adaptor Drive: 1/4" & 3/8"Sq Maximum Length: 40mm Minimum Length: 25mm Nett Weight: 0.37kg