Best Core Drill Bits for Drilling Granite (2026)
We selected bits based on diamond segment construction, range of diameters for granite work, stated tool compatibility, and value across sizes
The Verdict
- Best Overall: Diamond Core Drill Bits 1-1/4 in for hard stone and concrete — Best for tight holes: compact 32mm diameter with diamond segments for precise granite and hard-stone work
- Best Value: Diamond Core Drill Bits 1-1/2 in for hard stone and concrete — Best for common granite fixtures: 1-1/2-inch diameter balances reach and cut area for typical stone installations
This roundup covers core drill bits suited for drilling granite, comparing diameter options, diamond-segment construction, and compatibility with common rotary tools. Picks were chosen for material suitability (diamond segments for hard stone), range of diameters, and clear tool compatibility information
Top Picks
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1
Best Overall Diamond Core Drill Bits 1-1/4 in for hard stone and concrete
Best for tight holes: compact 32mm diameter with diamond segments for precise granite and hard-stone work
Laser welded diamond core bits for dry or wet drilling in hard stone, concrete, marble, and granite. Designed for angle grinders with 32mm diameter and 100mm length. One customer notes easy cutting and good value for money
- 32mm diameter diamond core bit
- laser welded construction
- versatile dry or wet drilling
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2
Best Value Diamond Core Drill Bits 1-1/2 in for hard stone and concrete
Best for common granite fixtures: 1-1/2-inch diameter balances reach and cut area for typical stone installations
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
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3
Diamond Core Drill Bits 1-3/8 in for hard stone
Best mid-size option: 1-3/8-inch diamond core that suits a range of granite and concrete drilling tasks
Laser welded diamond core bits for dry or wet drilling on granite, marble, and concrete. Notable for easy handling and solid build; users report good speed and value, with mixed durability feedback
- dry or wet drilling capability
- 35mm diameter core bit
- fast cutting with diamond segments
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4
SHDIATOOL Diamond Core Drill Bits 45mm (1-3/4") for hard stone
Best for larger openings: 45mm diameter offers deeper segment length for bigger granite and hard-stone holes
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