HSS Tin-coated Straight Flute Step Drill Bit Set in Wooden Box

Material: M35, 6542, 4341, 4241
Point: 118/135 Split Point
Surface Treatment: Bright Finish, Tin-coated, Amber Color, TiCN
Shank Available: Tri-Flat Shank, R Flute Hex Shank, Double R Flute Hex Shank
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° Split Point Tip and Center Punch: 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.