Tanya 4-12 4-20 4-32 mm HSS Titanium Coated Step Drill Bit Drilling Power Tools for Metal High Speed Steel Wood Hole Cutter Cone Drill

High-speed steel, high quality with good durability for you to use Professional drill for deburring, chamfering, elliptic hole enlargement Suitable for punch holes through sheet metal, steel plate, aluminum plate, brass or wood This drill bit set includes 3 sizes(4-12mm, 4-20mm, 4-32mm), which meet your different needs perfectly Specifications: Finish: Titanium Type: Step Drill Head Type: Hexagon Shank Material: High-speed steel 4241 Surface Treatment: Titanium coated Length: 5 Step Bit: 4-12mm Length: Approx. 6.7cm/ 2.64" 9 Step Bit: 4-20mm Length: Approx. 7.4cm/ 2.91" 15 Step Bit: 4-32mm Length: Approx. 10.2cm/ 4.02" The 3 Bits Sizes: 15 Step Bit: 4-32mm