Socket Flat Head Screw Head Type Flat System of Measurement Metric Drive Type Socket Drive Size 2.5 mm Material Steel Material Grade/Class Class 10.9 Finish Black Oxide Thread Size M4-0.7 Minimum Thread Length 22 mm Fastener Length 22 mm Head Height 2.3 mm Head Diameter 8 mm Pack Size Small Pack Thread Style Fully Threaded Special Features Not Applicable Countersink Angle 90 Degrees Dimensional Standards DIN 7991 Flange Diameter Not Applicable Flange Thickness Not Applicable