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 heatIt is very suitable for using to cut holes in a variety of materials including steel， brass， wood， plastic， etc1/4 Hex ShankMaterial: HSS SteelFinish: TitaniumLength:4-12mm Length: Approx. 6.7cm/ 2.64"4-20mm Length: Approx. 7.4cm/ 2.91"4-32mm Length: Approx. 10.2cm/ 4.02"The 3 Cutters Come in the Following Sizes:4-32mm (4mm， 6mm， 8mm， 10mm， 12mm， 14mm， 16mm， 18mm， 20mm， 22mm， 24mm， 26mm， 28mm， 30mm， 2mm)4-20mm (4mm， 6mm， 8mm， 10mm， 12mm， 14mm， 16mm， 18mm， 20mm， 14mm， 16mm， 18mm， 20mm��4-12mm (4mm， 6mm， 8mm， 10mm， 2mm)Package Included:1 x 3PCS HSS Steel Drill Bit Set 4-12/ 20/ 32mm