Bolt Head Type Hex Washer Material Steel Finish Phosphate Drive External Hex Thread Size 0.80mm Fastener Length 20 mm Head Width 8 mm Head Height 4 mm Drive Size 8 mm Pack Size Small Washer Outside Diameter 12 mm Washer Thickness 1.588 mm System of Measurement Metric Thread Style Fully Threaded Thread Direction Right Hand Thread Type Coarse Package Quantity 50