Donau Elektronik Drill Bits & Parts Metal twist drill bit set 632629 - Donau HSS275, The Donau Elektronik HSS275 is a metal twist drill bit set featuring 18 pieces with a cylinder shank, ideal for precision machining tasks. Manufactured by Donau Elektronik, these high-speed steel drill bits are suitable for drilling into sheet metal and steel. Typical applications include use in machining tools where accurate and efficient metal drilling is required. Donau HSS275 Metal Twist Drill Bit Set 18 piece Extra Long Cyl Shank