Century Drill & Tool. 29pc Pro-Grade Cobalt Drill Pod Set #26929. Cobalt drills are designed to cut through extremely hard metals, including stainless steel. Extremely heat resistant, must be used and operated in power units that have a RPM speed of 1,500 or more for maximum efficiency. Aerospace NAS 907-J specifications. Includes: 1/16″ to 1/2″ straight shank drills. Brand New and Never Been Used! Still in Original Packaging. We here at CBM TOOLS strive to provide 5-STAR Service every day. Your personal satisfaction is guaranteed on all products we sell.