21-PC Mini Drill Set Numbered 61-80 Jewelers Bit Index Pin Vise Chuck Aluminum. Automotive (8) Power Tools (351) Brand. Quick-Change Carbide Drill Bits Make fast bit changes— all of these bits have the same shank diameter, eliminating the need for different collets to hold each size. Number Size Drills Diameter in Inches; No. Drill Bits - Cobalt Drill Bits Numbered Sizes made in the USA are available from Bisco of Florida, Inc. Cobalt Numbered Drill Bits are sold at wholesale prices. The set comes organized in a metal … In practice, you will seldom see number sizes past #80. They are usually identified by the size of the screw they are designed pre-drill for, e.g. Taps . The coating on the drill bit set is also thermal resistant to make them run cooler and execute your drilling with expert precision. Open contact form FAQ Visit the Frequently Asked Questions section. Many times, we’re just trying to find out the alternative sizes available if you’re … It may not be totally evident at first glance. 6G … Toll Free 1-800-541-9301 | Phone:715-479-9365 | Fax: 715-479-9269 By Brian Hagan. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. We may already have the answer for your questions. Sold by iShopDirect. This particular page presents the numbered drill size series. Drill Bit Sizes and Drill Chart. Letter Sizes are Imperial drill bit sizes designated A (smallest) to Z (largest). Open contact form FAQ Visit the Frequently Asked Questions section. 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