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 Material: HSS Steel Finish: Titanium Spec: 4-32mm Length: Approx. 10.2cm/ 4.02" 4-32mm :4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm,