Nut Insert System of Measurement Inch Insert Diameter 1/2 in Overall Length 37/64 in Thread Size 5/16 In.-18 Thread Type Coarse Flange Diameter 0.537 in Material Steel Finish Zinc Plated Drill Bit Size 31/64 in Maximum Hole Diameter 0.516 in Minimum Material Thickness 0.094 in Package Quantity 25