4 mm, Head Width 17 mm, Package Quantity 100 Hex Head Cap Screw, System of Measurement Metric, Basic Material Steel, Material Grade Class 10..Thread Length 20 mm, Head Height 6.25, Fastener Length 20 mm, Fastener Thread Direction Right Hand, Fastener Thread Type Metric Fine, Fastener Thread Style Fully Threaded, Fastener Industry Standards DIN 961, Head Type Hex, Min.