Allen Nut System of Measurement Inch Insert Diameter 1 17/32 in Overall Length 1 17/32 in Installed Length Not Applicable Thread Size 1 In.-14 Thread Direction Right Hand Thread Type Fine 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 1 9/16 in Maximum Hole Diameter 1.605 in Minimum Material Thickness 1.532 in