Atoplee Chamfer Countersink Deburring Drill Bit Set Crosshole Cutting Metal Tool (All 4 sizes, gold) Surface treatment: titanizing Material: HSS4241,Handle type: round handle Handle diameter6mm,8mm,10mm,12mm; Head diameter:9.7mm,14mm,21mm,28mm Range of Chamfer hole:2-5mm,5-10mm, 10-15 mm, 15-20mm Package Included:4pcs Inclined Hole Chamfering Device