Allen Nut System of Measurement Inch Insert Diameter 1 23/64 in Overall Length 1 23/64 in Installed Length Not Applicable Thread Size 7/8 In.-9 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 1 13/32 in Maximum Hole Diameter 1.418 in Minimum Material Thickness 1.358 in