Allen Nut System of Measurement Inch Insert Diameter 19/32 in Overall Length 5/8 in Installed Length Not Applicable Thread Size 3/8 In.-16 Thread Direction Right Hand Thread Type Coarse Flange Diameter Not Applicable Flange Thickness Not Applicable Material Stainless Steel Material Grade/Class 18-8 Finish Plain Body Texture Knurled Compatible Material Metal Drill Bit Size 39/64 in Maximum Hole Diameter 0.61 in Minimum Material Thickness 0.621 in