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    CrownForce 4-1/4" Dry Core Drill Bit for Concrete, Brick & Block | Fits 4" Duct | 10" Depth | SDS-Plus, SDS-Max & Hex Adapters

    CrownForce 4-1/4" Dry Core Drill Bit for Concrete, Brick & Block | Fits 4" Duct | 10" Depth | SDS-Plus, SDS-Max & Hex Adapters

    $64.99 USD
    $64.99 USD
    Sale Sold out

    The vent hole bit that actually fits the duct.
    Here is the problem with 4" core bits: a 4" hole is too tight for a 4" duct. Guys drill the hole, the duct won't pass, and they're back on the wall re-drilling. The CrownForce CF-WC-108 cuts a true 4-1/4" (108mm) hole so standard 4" dryer vents, bath fan ducts, and PVC pass through clean on the first try.

    Fits the drill you already own▼
    • SDS-Plus adapter. Fits your rotary hammer (rotation-only mode).
    • SDS-Max adapter. Fits larger demo-class drills.
    • 1/2" hex adapter. Fits standard drill chucks. Use a drill with a side handle. A bit this size has serious torque.
    Built to last on real jobs▼
    • Laser-welded diamond segments, 10mm tall. Fused to the barrel, not glued. They hold up under heat and won't fly off mid-cut.
    • 10" working depth. Clears a full exterior wall assembly in one pass. Brick, block, or stucco over sheathing.
    • Dry cutting, rotation only. No water hookup. Drill from a ladder. Hammer function OFF.
    Specs▼
    Diameter 4-1/4" (108mm)
    Working depth 10" (250mm+)
    Thread 5/8"-11 (standard US)
    Segment height 10mm laser-welded
    Use Dry, rotation only
    Materials Concrete, brick, cinder block, masonry
    Common jobs for this bit▼

    Dryer vents. Bath fan vents. Range hood exhausts. 4" PVC pass-throughs. Any job where a 4" duct has to fit through the hole you just cut.

    Smaller hole?▼

    See the CrownForce 2-1/2" dry core bit for mini-split line sets.

    CrownForce Industries. Factory-direct diamond tools. We own our factory, so every tool is built right and priced fair.

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