3Pcs Tools Set Straight Groove Step Drill Bit 3-12mm 4-12mm 4-20mm HSS Titanium Coated Wood Metal Hole

Length: 3-12mm Length: Approx. 7.9cm 4-12mm Length: Approx. 6.7cm 4-20mm Length: Approx. 7.4cm

The Cutters Come in the Following Sizes: 3-12mm(3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm) 10 Steps 4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps 4-20mm:( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)9 Steps

Package included: 1 x Drill Bit 3-12mm 1 x Drill Bit 4-12mm 1 x Drill Bit 4-20mm

Material: high speed steel Surface treatment: Titanium plating Uses: Suitable for drilling and reaming of aluminum, pvc board, wood, plastic board and other materials, but not for high hardness materials such as walls, glass, and floors.