Description: Drillpro 3Pcs 1/4 Inch Hex Shank HSS Titanium Coated Step Drill Bit Set 3-12/4-12/4-20mm Specification: Brand: Drillpro Material: HSS / High Speed Steel Surface Treatment: Titanium Coated Shank Size: 1/4" Hex Shank Includes a five-step bit, nine-step bit and ten-step bit. Quantity: 3pcs The 3 Cutters Come in the Following Sizes: 4-12mm: 4mm,6mm,8mm,10mm,12mm 4-20mm: 4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm 3-12mm: 3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm Features: This is the New HSS Steel Large Step Cone Drill Titanium Bit Set Hole Cutter, which is made from high quality HSS steel, and with the Titanium coated to reduce friction and heat It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc Package Included: 1x Set (3pcs) HSS Step Drill Bit More Details: ,,,,,,,,,