This is the New HSS Steel Large Step Cone Drill Titanium Bit Set Hole Cutter. This is made from high quality HSS steel, and with the Titanium coated to reduce friction and heat. Suitable for cutting holes in a variety of materials including steel, brass, wood, plastic, etc. Features: Made from high quality HSS steel. Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. 3 Pcs Hss Drill Bit Set, quality tool for jobs of all sizes Titanium coated to reduce friction and heat Heat treated and highly polished. Drills perfectly round holes in steel, brass, plastic, wood etc. 3 sided shanks design in order to prevent slippage when in chuck. Two flute design provides faster, smoother and cleaner cuts. Each step is clearly labeled with the depth diameter in steps. Specification: Surface treatment: Titanium Plating Color: Golden Length: 4-12mm Length: Appox. 6.3cm/ 2.48 inch 4-20mm Length: Appox. 7.3cm/ 2.87 inch 4-32mm Length: Appox. 10cm/ 3.94 inch Step drill Cutting : 4-12mm Hole Sizes in 2mm Steps (5 steps) 4-20mm Hole Sizes in 2mm Steps (9 steps) 4-32mm Hole Sizes in 2mm Steps (15 steps) Package Included: 1x 3 Pcs Hss Drill Bit Set 1 x Acenix Brand cleaning Cloth. Warranty; 12-month Warranty. Any Question you have, please do not hesitate to contact us. We will get back to you within 24 hours.