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Material: High resolution steel, high hardness, anti-rust, sturdy and durable. Size: 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 50mm, 53mm, to meet to your different needs. High precision drill bits, highly impact resistant and wear-resistant, providing smooth cutting. Sharp teeth and anti-cut with low consumption for a long time. MULTIPLE USES: Suitable for steel plate, iron plate, stainless steel and all kinds of thick materials. The perforation, the maximum depth is less than 5 mm. High speed steel teeth for fast cutting clean and round holes. Suitable for manual electric drill, motorized column drilling machine and separate cable magnetic drilling machine.