4-1/4" Diamond Core Drill Bit for 4" Dryer Vent & Duct Holes in Concrete, Brick & Block, Dry Cut, 10" Depth, SDS-Plus & Tri-Flat Adapters - CrownForce

Two adapters included, both with a 5/8"-11 thread:

• SDS-Plus adapter. Fits your rotary hammer. Use drill mode only, hammer OFF.
• Tri-flat shank adapter. Fits any standard 1/2" drill chuck. Use a drill with a side handle. A bit this size has serious torque.

No center bit. Drill a 1/4" pilot hole all the way through first to mark the exit point, then core halfway from each side for clean edges on both faces.

• Diamond segments. Made for dry cutting through concrete, brick, and block.
• 10" working depth. Gets through 8" block and most solid brick walls in one pass. Brick over wood studs? Core the masonry, then switch to a hole saw for the wood.
• Dry cutting, rotation only. No water hookup, so you can drill from a ladder. Indoors, keep a shop vac at the hole to catch the dust. Runs on any rotary hammer with a rotation-only (drill) mode; hammer function OFF.

Dryer vents. Bath fan vents. Small range hoods with a 4" duct. Any job where a 4" duct has to fit through the hole you just cut.

Note: 4" PVC pipe measures 4.5" on the outside and will not fit a 4-1/4" hole. Most range hoods use 6" duct or larger; check yours before you drill.

Not for rebar or heavily reinforced concrete.

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