Thumb Screw, Type Thumb Screw, Finish Zinc-Plated, Material Iron, Thread Size 5/16 In.-18, Fastener Length 3/4 in, Head Width 1.25 in, Head Height 0.66 in, Tensile Strength -, Head Type Wing, Maximum Head Width 1 1/4 in, Minimum Head Width Not Applicable, Maximum Head Height 21/32 in, Minimum Head Height Not Applicable, System of Measurement Inch, Head Material Iron/Zinc, Head Shape Wing