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This bits should use the bench drill , it is easy to shake and it will affect the chamfering effect if you use the hand drill Chamfer range: 2 to 5mm, 5 to 10mm, 10 to 15mm, 15 to 20mm; Shank diameter: 6mm, 8mm, 10mm, 12mm; Head diameter: 10mm, 14mm, 21mm, 28mm Application: Suitable for cutting thin metal, wood,plastic and thin iron plate hardness less than 25 degrees Use: 90 degree angle on the point for sharp and precise countersinking, used for workpiece circular aperture chamfering or cone hole Material: Made of high speed steel, titanium coated