Thumb Screw, Grip Style Smooth, Type Thumb Screw, Finish Zinc-Plated, Material Iron, Thread Size 1/4 In.-20, Fastener Length 2 1/2 in, Thread Style Fully Threaded, Thread Length Not Applicable, Head Width 1.25 in, Head Height 0.813 in, Tensile Strength 50,000 psi, Head Type Wing, Maximum Head Width 1 1/4 in, Minimum Head Width Not Applicable, Maximum Head Height 13/16 in, Minimum Head Height Not Applicable, System of Measurement Inch, Drive No Drive, Head Material Iron, Head Shape Wing