Made of industrial quality chrome vanadium steel. _x000D__x000D_
Fully hardened and tempered. _x000D__x000D_
Black rustproof finish. _x000D__x000D_
Long arm SAE sizes: 0.028in; 0.035in; 0.05in; 1/16in; 5/64in; 3/32in; 7/64in; 1/8in; 9/64in; 5/32in; 3/16in; 7/32in; 1/4in; 5/16in and 3/8in. Short arm metric sizes: 0.7mm; 0.9mm; 1.3mm; 1.5mm; 2mm; 2.5mm; 3mm; 4mm; 4.5mm; 5mm; 5.5mm; 6mm; 7mm; 8mm and 10mm.