Draper Expert HSS Cobalt Drill Bit

The 11.3mm Draper Expert HSS Cobalt Drill Bit provides precision sizing for specialist engineering applications where exact hole dimensions are paramount. This intermediate diameter fills a critical gap between standard metric increments, making it invaluable for tool and die work, precision fabrication, and applications requiring specific clearance tolerances. The 230mm overall length delivers the reach required for drilling through substantial materials whilst maintaining the control essential for accuracy. Constructed from high-speed steel with 5% cobalt content, this drill bit excels in demanding applications involving harder materials. The cobalt addition transforms the bit's wear characteristics and heat resistance, allowing it to maintain its sharp cutting edge far longer than standard HSS bits when drilling stainless steel, hardened metals, and other challenging materials. This enhanced durability ensures consistent performance and reduces the frequency of tool changes during extended drilling operations.