Thumb Screw, Grip Style Knurled, Type Thumb Screw, Finish Black Oxide, Material Steel, Thread Size 5/16 In.-18, Fastener Length 1 1/2 in, Thread Style Fully Threaded, Thread Length Not Applicable, Head Width 1.25 in, Head Height 0.25 in, Tensile Strength 57,000 psi, Head Type Cheese, Maximum Head Width 1 1/4 in, Minimum Head Width Not Applicable, Maximum Head Height 1/4 in, Minimum Head Height Not Applicable, System of Measurement Inch, Drive No Drive, Features Straight Knurl