Piece Hss 1/2 Cylindrical Shank Drill Bit 23mmTool Sets -1 Piece HSS 1/2 Cylindrical Shank Drill Bit 23mm Highlights Generic 1 Piece HSS 1/2 Cylindrical Shank Drill Bit 23mm Made of high speed steel for proven capacity and durability . Twist Design: Increases cutting speed with self-centering and prevents walking, removes chips and particles faster Suitable for all types of stainless steel, carbon steel, angle iron, aluminum, copper, wood and other materials. For precision drilling, electronics assembly, tool making, model making, jewelry engraving and hobbies. Set Include: 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm Specification: Material: High Speed Steel Size Chart: Size: 21mm/0.83inch, 22mm/0.87inch, 23mm/0.91inch, 24mm/0.94inch, 25mm/0.98inch, 26mm/1.02inch, 27mm/1.06inch, 28mm/1.10inch Package Include: 1 Piece Twist Drill Bit