Cobalt Twist Drill, #50, 10pk

10-Pks of Cobalt Steel Twist Drills in 31 sizes from #50 to #80. Order by wire gauge. 20,000 RPMs Max. Choose an Option to select the size. See chart for Gauge – inch – Metric equivalents. Use the Product Options Menu above to select Drill Size: #50 (A-8350), #51 (A-8351), #52 (A-8352), #53 (A-8353), #54 (A-8354), #55 (A-8355), #56 (A-8356), #57 (A-8357), #58 (A-8358), #59 (A-8359), #61 (A-8361), #62 (A-8362), #63 (A-8363), #64 (A-8364), #65 (A-8365), #66 (A-8366), #67 (A-8367), #68 (A-8368), #69 (A-8369), #70 (A-8370), #71 (A-8371), #72 (A-8372), #73 (A-8373), #74 (A-8374), #75 (A-8375), #76 (A-8376), #77 (A-8377), #78 (A-8378), #79 (A-8379), #80 (A-8380). For use in a small pin vise and other hand tools that hold wire gauges or in rotary handpieces with A-MC2 and A-M50 micro chucks. Order by wire gauge. 20,000 RPM Maximum Speed Cobalt steel is high-speed steel that contains more cobalt. They hold their hardness at much higher temperatures and can be used to drill stainless steel and other hard materials. Because they are very hard, they can be slightly brittle, so offering them in packs of ten makes sense. Check Out The Foredom Tools Catalog Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided. X