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 The 3 cutters come in the following sizes increments of 2mm : 4 - 32mm ,4 - 20mm, 4 - 12mm. 100% brand new and high quality Parameters: 1. Material: high speed steel 2. Specifications: 4-32,4-20,412, hexagonal handle: about 6.35 mm/ 0.25 in 3. Applicable scope: woodworking punch 4. The product is available in 4-32,4-20,412 three specifications. Read Less