FEATURES : - Made from high quality HSS steel - Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. - 3Pcs 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 SPECIFICATIONS : - Surface treatment: Titanium Plating - Color: Golden - 4-12mm length: 6.3cm/ 2.48inch - 4-20mm length: 7.3cm/ 2.87inch - 4-32mm length: 10cm/ 3.94inch