Norseman by Viking Drill and Tool (pack of 6) 21/64" 135° Ultra BOR Super Premium HSS Jobbers Drill. Special Hi-Molybdenum tool steel. 21/64" Diameter , 4 5/8" Overall Length. 135 Degree Split Point - For fast penetration & accuracy without center punch. Gold Surface treated for maximum lubricity. Heat treated & nitro-carburize finished to be measurably harder than high-speed steel (05750)