Best Core Drill Bits Under $100 (2026)
We ranked options under $100 by value score using material suitability, diameter/depth options, segment type, and brand consistency from comparable listings
The Verdict
- Best Overall: Diamond core drill bits 2-1/2 inch for porcelain tile — Best for porcelain tile: continuous rim diamond core bit designed to cut clean holes with minimal chipping
- Best Value: Ecarke Diamond Grinder Bit Head Set for Glass — Best for glass work: diamond grinder bit set tailored for stained glass and glass shaping on benchtop grinders
Top Picks
-
1
Best Overall Diamond core drill bits 2-1/2 inch for porcelain tile
Best for porcelain tile: continuous rim diamond core bit designed to cut clean holes with minimal chipping
Diamond core drill bits for dry/wet drilling in porcelain tile, ceramic, marble, and stone. Features 65mm diameter, 5/8-11 connection, 75mm height, max 50mm depth, diamond height 15mm. Customers note clean cuts and ease of use
- dry/wet drilling capability
- 65mm diameter with 15mm diamond height
- 5/8-11 connection
-
2
Best Value Ecarke Diamond Grinder Bit Head Set for Glass
Best for glass work: diamond grinder bit set tailored for stained glass and glass shaping on benchtop grinders
Diamond grinding bits in 4 sizes with brass core and wrenches for stained glass work. Versatile sizes support multiple grinding tasks. Customers note good value and compatibility with grinders, though durability varies
- multi-size diamond bits
- brass core construction
- includes wrenches
-
3
Diamond Core Drill Bits 1-1/4 in for hard stone and concrete
Best for hard stone tasks: 1-1/4-inch diamond core bit built for concrete, granite and similar materials
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
-
4
Diamond Core Drill Bits 1-1/2 in for hard stone and concrete
Best for medium stone holes: 1-1/2-inch diamond core bit intended for granite, marble and hard stone drilling
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
-
5
Diamond Core Drill Bits 1-3/8 in for hard stone
Best for 35mm applications: 1-3/8-inch diamond core bit optimized for hard stone and precise hole cutting
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
-
6
Diamond Beveling Chamfer Bit for Granite & Tiles, 82mm dia
Best for beveling and chamfering: large 82mm diamond bevel bit for finishing granite and tile edges
Diamond beveling chamfer bit enlarges and shapes holes in porcelain, ceramic, granite, and marble. Works for radius cuts with quality and ease of use; some users note fit issues with grinders
- diamond grit #80/100
- 3 1/2 inch (82mm) diameter
- 5/8-11 or M14 thread
-
7
SALI Diamond Core Drill Bit 1in 10in Depth
Best for shallow core cuts: 1-inch diamond core bit with 10-inch depth rating for masonry and concrete work
Diamond core drill bit for concrete, brick, and masonry with 1in diameter and 10in drilling depth. User feedback highlights solid workability and quality, with some reports of teeth breakage
- 1in diameter core bit
- 10in drilling depth
- laser-welded turbo segments
-
8
SHDIATOOL Diamond Core Drill Bits 45mm (1-3/4") for hard stone
Best for larger stone holes: 45mm (1-3/4") diamond core bit suited to wet or dry hard-stone drilling
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
-
9
Diamond Beveling Chamfer Bits for granite/marble (2
Best for stone chamfers: chamfering bit designed for granite and marble edge finishing and hole enlargement
Diamond beveling chamfer bits enlarge, shape and bevel existing holes in porcelain or hard ceramic. Works with angle grinders; compatible with 5/8-11 thread, adapter needed for hand drills. Customers note consistent bevels and quality; durability praised
- two-piece 2-inch bits
- diameter 50mm, length 46mm
- 5/8-11 thread for angle grinders
-
10
Diamond Hole Saw 2-1/2" Core Drill Bit for Tile Granite Marble Ceramic Glass
Best budget hole saw: 2-1/2-inch diamond hole saw for tile, ceramic and glass hole cutting
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