Combination drill, no more using a drill to drill the hole and then tapping it out later with another tool. one and works great and of time and trouble. These taps are designed with spiral flutes and the chip clearing process would be better. These taps are made by and surface finished by nitriding for high hardness and rust resistance. Features - Color: Assorted color. - Material: Steel. - Size: 7.00 x 0.60 x 0.50cm/ 2.75 x 0.24 x 0.20 inch. - The surface is coated with titanium alloy to improve the cutting performance of the drill and increase wear-resistant durability, so to prolong the life. - Drill, and counter sink three-in-one operation enables hole drilling, tapping, deburring and countersinking in one step. - Saving a lot of time and efforts during your jobs on copper, brass, aluminum, sheet metal and plastic. - This set includes 6 most welcome sizes. Each drill is engraved with its size, can choose the accurate bit without any difficulty. - These drill bits are must have if you fabricate a lot. Package list: 6 x drill bits