COMPLETE HOLE DRILLING, TAPPING AND DEBURRING/COUNTERSINKING IN ONE OPERATION WITH POWER DRILL SAVES LABOR AND TIME. BACK TAPERED BEYOND TAP TOPREVENT THREAD DAMAGE FROM OVER-DRILLING. DEBURR/COUNTERSINK ALSO PROVIDED ON BIT BEYOND BACK TAPER. MADE FROM HARDENED HIGH-SPEED STEEL VS. CARBON STEEL FORLONGER LIFE. HIGH QUALITY HEX SHANK TO ENSURE STRONG CONNECTION TO DRILL CHUCK. DESIGNED TO TAP UP TO 10-GAUGE METAL. QUICK CHANGE ADAPTOR INCLUDED IN BOTH METRIC AND STANDARD KITS.