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Smooth Step Drill Bit with Black AITiN Coating M35 Cobalt, Spiral Flute, 6 Sizes from 3/16 inch. a 1/2 in, 1/4 in Hex Shank 6 Hole Sizes: 3/16" (4.76mm), 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.52mm), 7/16" (11.11mm), 1/2" (12.7mm), with 1/16" (1.59mm) increments. Size markings are printed next to each step for easy wearing. Double spiral flutes for more efficient chip cleaning; 1/4 in hex shank with quick-release groove to eliminate slipping. The addition of cobalt increases heat resistance. It is widely used in metal manufacturing due to its ability to resist wear over conventional fast steels, allowing shorter cycle times in production environments due to higher cutting speeds or increased time between hardware changes Titanium Aluminum Nitride (AlTiN) is typically applied to steel, hardened steels, and stainless steel materials where high wear resistance and lubrication are required. AlTiN coating provides exceptional oxidation resistance and extreme hardness. That's why this coating works well in very demanding cutting tool applications, especially when tools are being pushed to the fullest.