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Ultra high precision ground drills in tough tungsten carbide - ideal for working on stainless steel, platinum, and other hard metals. All have 3/32" (2.30mm) shanks, an easy fit for quick release and chuck style handpieces. Four piece set includes nice sizes: 0.50, 1.00, 1.20, 1.70mm. Individual sizes are available in 19 sizes from 0.50 to 2.30mm.