Core Bits

When you need a clean, round hole through concrete, block or brick for a pipe, conduit run, dryer vent or condensate line, a core bit is the only tool that does it without cracking the wall. DMTools diamond core bits use diamond-impregnated segments brazed to a steel barrel — the diamonds grind the masonry away while the open barrel removes the core in one plug. The result is a precise, full-diameter hole with clean edges, not a hammered-out mess. We stock the common core diameters for the trades that drill them daily — plumbers, electricians, HVAC and low-voltage installers — sized for standard pipe, conduit and vent openings. For deep walls, add a core-bit extension to reach all the way through a thick foundation or double-wythe brick without stopping. Pair the bit with the right setup for your wall thickness and you'll core it in a single pass. Diamond tooling is where brand markup gets steepest, and where honest pricing saves you the most. You're buying real diamond segment and a true-running barrel — not a premium for the box. Buy the single diameter the job needs, add an extension if the wall is deep, and core it right the first time. Pick up in Hamilton at 1565 Barton St E on Fridays and Sundays, 10–5, or ship Canada-wide; pickup is always free. Browse core bits and extensions below and sort by diameter or price — and tell us your wall and opening if you want help sizing.