Safety Pin System of Measurement Inch Wire Diameter 0.091 in Shank Length 4 7/16 in Pin Diameter 5/16 in Pin Type Snap Material Steel Material Grade/Class Grade 1018 Finish Zinc Plated Outside Diameter Tolerance +0.306/-0.311 in Shank Length Tolerance +0.125/-0.000 in Usable Length 4 in Product Type Safety Pin Wire Shape Square Wire Type Single Height 11/16 in Includes Not Applicable Material Quality Standards Not Applicable Dimensional Standards Not Applicable