Thumb Screw, Type Quarterturn Thumb Screw, Finish Black Oxide, Material Steel, Thread Size 1/2 In.-13, Fastener Length 2 1/4 in, Thread Style Partially Threaded, Thread Length 2 1/64 in, Head Width 1.25 in, Head Height 1 in, Tensile Strength 57,000 psi, Head Type Spade, Maximum Head Width 1 1/4 in, Minimum Head Width Not Applicable, Maximum Head Height 1 in, Minimum Head Height Not Applicable, System of Measurement Inch, Drive No Drive, For Use in Systems Jig and Fixture Component