Nut Insert System of Measurement Inch Insert Diameter 3/8 in Overall Length 33/64 in Thread Size 1/4 In.-20 Thread Type Coarse Flange Diameter 0.408 in Material Steel Finish Zinc Plated Drill Bit Size 25/64 in Maximum Hole Diameter 0.391 in Minimum Material Thickness 0.094 in Package Quantity 50