1、Step drill bits 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: 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、The spiral Groove: creates better, less noise, less force has to be used.