The CMT 552-008 Diamond Dry Hole Saw is a precision 5/16 in. (8mm) diameter hole saw engineered for cutting hard tiles, natural stone, and artificial stone surfaces without the need for water cooling. Built with diamond grit featuring cubo-octahedral crystals, this compact hole saw delivers fast, clean cuts through ceramic, gres, granite, marble, and engineered stone materials. Its hexagonal shank provides a secure, no-slip grip in standard drill chucks, making it a reliable choice for tile installers, stone fabricators, and remodeling professionals who need accurate small-diameter bores in demanding hard-surface materials.

Key Features

• Diamond Grit with Cubo-Octahedral Crystals - inclusion-free, heat-resistant diamond crystals cut faster and last longer than conventional hole saws, reducing replacement frequency on hard tile and stone drilling jobs.
• Dry Cutting Design - engineered for dry use so there is no need for a continuous water supply, simplifying setup and making this hole saw practical for on-site or finished-space work.
• 5/16 in. (8mm) Diameter - a precise, small-diameter bore size ideal for drain openings, fastener pass-throughs, and fixture mounting holes in tile and stone where accuracy matters most.
• Hexagonal Shank - the hex shank seats firmly in quick-change chuck systems and standard drill chucks, preventing bit slippage during high-torque stone drilling.
• 1-3/8 in. Cutting Depth - sufficient cutting height to bore through typical tile, stone slabs, and layered installations in a single pass.
• 2,200 to 4,000 RPM Operating Range - a defined speed window keeps heat buildup in check and protects both the bit and the workpiece surface during dry drilling operations.
• 3-1/8 in. Total Length - compact overall length allows use in tight spaces and confined drill runs without sacrificing reach into the material.

Why This Product

• Designed specifically for marble, granite, ceramic, and engineered stone - this hole saw addresses one of the most challenging small-diameter drilling tasks in tile and stone work, where standard bi-metal or carbide saws fail quickly or crack the surface.
• The dry cutting capability means no water feed equipment is required - professionals can use a standard cordless or corded drill and work in finished or occupied spaces without the mess and setup time of wet-cutting systems.
• The cubo-octahedral diamond grit construction provides superior crystal retention and cutting consistency, meaning fewer bit changes and a cleaner bore edge in materials like gres and artificial stone surfaces such as Okite and Silestone.
• The hexagonal shank paired with the 2,200-4,000 RPM recommended speed range gives users a clear operating guideline to maximize bit life and achieve accurate, chip-free holes in hard, brittle surfaces.

Specifications

• Manufacturer Part Number: 552-008
• Brand: CMT Orange Tools
• Diameter: 5/16 in. (8mm)
• Cutting Height: 1-3/8 in.
• Total Length: 3-1/8 in.
• Shank: Hexagonal
• Recommended Speed: 2,200 - 4,000 RPM
• Blade Material: Diamond Grit Coated

Approved Applications

• Drilling hard ceramic and gres tiles
• Drilling natural hard stone - granite and marble
• Drilling artificial and engineered stone surfaces