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Features: ATTENTION: please make sure the drill bits and board at 90 degree angle when you use the hole saw kit Has a good processing and cutting use. And wide application for stainless steel, iron, Aluminum Alloy and other kinds of metal plate with a hole. Applicable for pistol drill, bench drill, vertical electric drilling machine etc.. These drill have different shank. For the shank size below 70mm, it suitable for 10mm or more chucks, and for shank size more than 70mm, it suitable for 13mm or more chucks. Low consumption with more powerful clamping force Perfect for installing locks,knobs in doors and cabinets or drilling larger diameter holes through desks ect. Each edge is a part of the characteristics of the cutting work, making the hole is not easy to produce the phenomenon of collapse Specification: Material: HSS high speed steel Color:silver Quantity: 14pcs Cutter thick: within 2mm Diameter size: 16mm/0.63", 18mm/0.71", 20mm/0.79", 22mm/0.87", 25mm/0.98", 26mm/1.02", 28mm/1.10", 30mm/1.81", 35mm/1.38", 40mm/1.57", 42mm/1.65", 45mm/1.77", 50mm/1.97", 53mm/2.09". Length: 65~70mm size of Shank: 7~8.7mm Package included: 14pcs HSS high speed steel hole saw kits