Features:1) Spiral Hole Cutter Step Drill Bits2)Material:HSS 4241,Surface Coated Nitriding3)Shank Size:9mm,8mm,6mm4)Use for workpiece,PVC board,inslutaion board,thin Carbon Steel board with hardness those workpieces you want to cute holer,the thinkness should be less than 5mm.5)weight is about 222gSize:4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm,30mm,32mm)4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)4-12mm (4mm, 6mm, 8mm, 10mm, 12mm) Package Included:3pc Nitriding Coated Spiral Groove Cone Step Drill Bits
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