Features
 1. Step drill bits are perfect for drilling and enlarging multiple-holes in thin sections of sheet metals, pipes, plexiglass,plastics, wood up to a thickness of 5mm. 
2. 135° Spilt Point Tip: increases cutting speed with self-centering and the drills do not run off center. 
3. A variety of hole diameters can be drilled using only one tool. 
4. The dimension of drilled hole is exact. 
5. Two Flute Design: provides longer life and better chip removal. 
6. Titanium coating provides up to 2 times the life over high speed steel. 
7. Only for rotary use.