Best Core Drill Bits for Drilling Granite Countertops (2026)
We prioritized bits with diamond or vacuum‑brazed cutting faces, common countertop hole diameters, user ratings, and clear wet/dry usage specifications to rank fit and value
This roundup identifies core drill bits suited for cutting clean holes through granite countertops, focusing on diamond and vacuum‑brazed designs appropriate for hard stone. Picks were chosen by evaluating material construction (laser welded or vacuum brazed diamonds), size coverage for common fixture holes, and real‑world user ratings to balance fit and value
Top Picks
-
1
Diamond Core Drill Bits 1-1/2 in for hard stone and concrete
Diamond core drill bit for hard granite, marble, engineering stone, concrete and brick. Ideal for faucet mounting holes in stone countertops and plumbing lines in showers and vanities. Customers note smooth cuts and solid build with reliable speed
- hard stone and concrete compatibility
- diamond bit with fast performance
- versatile for plumbing and countertop work
-
2
SHDIATOOL Diamond Core Drill Bits 45mm (1-3/4") for hard stone
Diamond core drill bits for dry or wet drilling on hard stone, granite, concrete and marble. 45mm diameter with 100mm length; dry drilling endorses longer segment life when used wet. Customers note easy cutting and good build quality, with some durability variability
- laser welded diamond segments
- 45mm diameter suitability for hard stone
- dry or wet drilling versatility
-
3
Diamond Hole Saw 2-1/2" Core Drill Bit for Tile Granite Marble Ceramic Glass
Diamond core drill bit with vacuum brazed diamond coating for long life, suitable for dry and wet drilling. Designed for cutting holes in hard materials like granite, marble, ceramic, and glass. Customer insight: easy to use with positive quality and durability, though there may be slight chipping
- 65mm diamond core bit
- vacuum brazed diamond coating
- 2-1/2" cutting capacity