Tamper Screw, Head Type Flat, Material 18-8 Stainless Steel, Finish Plain, Drive Spanner, Thread Size #4-40, Fastener Length 1/2 in, Head Width 0.225 in, Head Height 0.067 in, Drive Size #4, Dimensional Standards ASME B18.6.3, Pack Size Small, Type Tamper Screw, Maximum Head Width 0.225 in, Minimum Head Width 0.195 in, System of Measurement Inch, Thread Type Coarse, Package Quantity 50