Product description:
Material: high speed steel and titanium nitride coating
Size:4-12 grade 5(diameter 4,6,8,10,12mm),4-20 grade 9(diameter 4,6,8,10,12,14,16,18,20mm),4-32 grade 15(diameter 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm)
Wide range of applications: perfect step drill for drilling holes in a wide range of materials: up to 3mm/0.12inch (iron, copper, aluminium), up to 5mm/0.2inch (wood, PVC board, insulation board). Not suitable for hard and brittle materials, such as stainless steel, glass, tile floors, walls, etc.
Friendly reminder:
1.It is recommended to oil the drill bit before each use.
2.Please drill a smaller hole for smoother drilling.
3.Please do not set the drilling speed too high to avoid damaging the cutting edge.
4.The thickness of the metal material to be drilled should not exceed 0.18 inch.
5.Filling cold water while working can effectively prolong the life of the drill.