Thumb Screw, Finish Zinc-Plated, Material Iron, Thread Size M4x0.70, Fastener Length 16 mm, Head Width 20 mm, Head Height 10.5 mm, Head Type Wing, Maximum Head Width 20 mm, Minimum Head Width Not Applicable, Maximum Head Height 10.5 mm, Minimum Head Height Not Applicable, System of Measurement Metric, Dimensional Standards DIN 316, Head Shape Rounded Wing