Safety Pin, Double Wire Snap, Basic Material Steel, Material Grade Not Graded, Fastener Finish Zinc Plated, Pin Dia. 5/16 in, Usable Length 2 1/2 in, Pilot Dia. -, Dia. Tolerance +0.306/-0.311, Length Tolerance -0.250 in, Shank Length 2 3/4 in, Overall Length 3 1/16 in, Wire Dia. 0.091 in, Wire Shape Round