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Material:HSS6542 Shank Type:Triangle shank Type:Spiral groove Suit for use in hardness under 28 artifacts,(Such as: Stainless steel , iron plate, aluminum, wood ) .The plate thickness under 5 mm Size: 001:4mm to 12mm 9 Steps (4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm) shank diameter 6mm 002:4mm to 20mm 9 Steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm,18mm,20mm) shank diameter 8mm 003:4mm to 32mm 15Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm,30mm,32mm) shank diameter 10mm Package Included: 3 pcs HSS6542 Spiral groove STEP DRILL