#1-5 Center Drills, High Speed Steel, LittleMachineShop.com (1230)

This set includes five different sizes of combined drills and countersinks, commonly called center drills. They are used to produce a center hole on a workpiece for turning between centers.

Center drills are also used to start drilled holes. Because they are very stiff they don't have a tendency to wander.

The set is high speed steel and includes sizes 1, 2, 3, 4, and 5. These are 60 degree center drills with a right hand cutting direction. Each center drill is made of ground high speed steel for good wear resistance with a hardness rating of Rc 58 - 60.