The Whirlibit from Crowder Supply is a carbide-tipped drill bit that puts fast, clean holes in rock, concrete and masonry using the percussion tools already on your truck. Shank options 7/8 x 3-1/4 in. hex, 7/8 x 4-1/4 in. hex, 1 x 4-1/4 in. hex, CP 9 (3/4 in. round with slots) and U7 (9/16 x 1-3/4 in. hex) cover handheld rock drills and chipping hammers, with bit sizes from 3/8 in. to 1-1/2 in. and drilling depths from 6 in. to 45 in.
Whirlibits earn their keep on anchor holes, pin holes, drain holes and utility penetrations where mobilizing a dedicated drill is overkill. Pick the shank that matches your tool, the bit diameter for the anchor, and the drill depth for the job. For dedicated production drilling, threaded rock drill bits on a proper string are the better tool the rock drill bit buyers guide covers where each makes sense.
- Bit diameters from 3/8 in. to 1-1/2 in. for anchor, pin and utility holes
- Drill depths from 6 in. to 45 in.
- Shanks: 7/8 x 3-1/4 in. hex, 7/8 x 4-1/4 in. hex, 1 x 4-1/4 in. hex, CP 9 (3/4 in. round with slots) and U7 (9/16 x 1-3/4 in. hex)
- Carbide-tipped cutting head for rock, concrete and masonry
- Runs on the percussion tools you already own no dedicated drill required
- Applications: anchoring, quarrying, geotechnical sampling, tunneling and utility work
- Stocked by Crowder Supply in Denver
Whirlibit FAQ
What is a whirlibit?
A whirlibit (or whirly bit) is a one-piece rotary rock drill bit: a carbide cutting head on an integral hex shank, optimized for high-speed rotation with flushing channels that carry cuttings out of the hole.
What sizes do whirlibits come in?
This page covers the 7/8 x 3-1/4 in. hex shank family with bit faces of 1, 1-1/8, 1-1/4, 1-3/8 and 1-1/2 in. and drill depths from 9 to 45 in. pick the face and depth combination your hole calls for.
What drill runs a whirlibit?
Any rock drill with a 7/8 x 3-1/4 in. hex chuck the standard front end on most light and mid-class handheld drills accepts the integral shank directly.
Whirlibit or a standard shanked rod and bit which should I buy?
The one-piece whirlibit is the simple choice for fast small-diameter holes at fixed depths; a shanked rod running a carbide-tipped button bit suits percussion drilling where you swap bits and steels. The rock drill bits buyer’s guide compares the options.