6PCS Steel Titanium Step Drill Bit Set 4-12/20/32mm Metal Hole Cutter Wood Cone Core Drilling Hole Saw Tool

[Material]:High-speed steel 4241[Handle]: Step drill is triangle round handle, prevent slipping. The saw drill is round handle.[Surface Treatment]: The gold is titanium coating, more wear and oxidation resistance, not rust.4 - 12 mm 5 Steps (4mm,6mm,8mm,10mm,12mm)4 - 20 mm 9 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm)4 - 32 mm 15 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm,30mm,32mm)Saw drill: 3mm, 6mm, 8mm.1 X 4mm-12mm Grooved Drill Bit1 X 4mm-20mm Grooved Drill Bit1 X 4mm-32mm Grooved Drill Bit1 X 3mm Saw Drill1 X 6mmSaw Drill1 X 8mmSaw Drill