Step Bit Set : KULKONI (3pc)

A three-piece step drill bit set from KULKONI. A single step bit drills every size within its own cone; three of them together cover a span no drill index can match without carrying dozens of separate bits, and they do it in thin material without the grabbing and triangular holes an ordinary twist bit leaves in sheet. That is why this is the set electricians and sheet-metal workers buy once and keep: knockouts in enclosures and consumer units, cable gland holes, holes in trunking, ducting and casings, and enlarging existing holes without stopping to change tools. Run them slowly with steady pressure and stop at the step you want - the steps are marked, but it is easy to push one too far and open the hole out too wide.