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Step drill bits, also called cone bits, drill several hole sizes with one bit. Electricians, aircon installers and fabricators use them to open holes in sheet metal, electrical panels, junction boxes and plastic enclosures, and to enlarge or deburr existing holes.
How to choose a step drill bit
- Size range: 4-12mm and 4-20mm bits suit small holes and cable entries. 4-32mm, 6-38mm and 10-45mm bits cover conduit fittings and larger openings.
- Shank: 1/4" hex shanks fit impact drivers and quick-change chucks. Straight and three-flat shanks grip firmly in a drill chuck.
- Material: HSS bits suit mild steel and aluminium. Cobalt (HSS-E M35) and TiN-coated bits last longer in stainless steel.
- Single bit or set: 3- to 6-piece sets cover the common sizes for the toolbox.
Use with
Drill at low speed and use cutting oil on steel. Use with a cordless drill, or see metal hole saws for larger holes and metal drill bits for standard holes.
All products from KHM Megatools are genuine.
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