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High Speed Steel (HSS) twist drills have the same diameter shafts as the drills themselves and are commonly referred as "number drills" as each size has a designated number. For example, a # 60 would be 1 mm in diameter. Smaller sizes have higher numbers, We sell adaptor chucks (see below) that allow you to use this tiny drills with a handpiece that uses 3/32" collets, like the popular jewelers quick change handpieces or fixed collet style handpieces. HSS twist drills are made in Germany and sold in packages of 10 in the easy to recognize red box.
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