New Brunner & Lay dowel hole drilling whirl bit 1 x 4 1/4 x 24 x 1 1/8 - $55 (Pearland)
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New carbide drill bit for concrete or rock. Shanked connection for air or electric rock drills. Will drill a 1.5" hole up to 20” deep. Has water channel.
I also have many good used ones in shanked and C9 for $25 a piece.
Firm price. I can do $20 on the used ones if you want to buy 5 or more.