Allen Nut System of Measurement Inch Insert Diameter 1/4 in Overall Length 15/64 in Installed Length Not Applicable Thread Size #6-32 Thread Direction Right Hand Thread Type Coarse Flange Diameter Not Applicable Flange Thickness Not Applicable Material Steel Material Grade/Class Grade 2H Finish Black Oxide Body Texture Knurled Compatible Material Metal Drill Bit Size 17/64 in Maximum Hole Diameter 0.27 in Minimum Material Thickness 0.23 in