CMT 550-079X Multi-Purpose TCT Hole Saw is a 3-1/8 in. (79mm) tungsten carbide-tipped hole saw engineered for demanding multi-material cutting tasks. Built with a right-hand rotation design and four hardened carbide teeth, this hole saw delivers clean, efficient bores through a wide range of construction materials - from wood and sheet goods to masonry and plastics. The hexagonal shank interface ensures a secure, vibration-resistant connection to compatible arbors, making it a reliable choice for professional contractors and skilled tradespeople working across diverse job site conditions.

Key Features

• 3-1/8 in. (79mm) cutting diameter - precisely sized for standard rough-in openings and fixture installations, eliminating the need for secondary finishing passes.
• 60mm cutting depth - reaches through thick framing members, stacked panels, and deep substrates in a single plunge, reducing repositioning time on the job.
• Tungsten carbide-tipped (TCT) teeth - HW grade material - delivers extended edge retention and heat resistance compared to bi-metal alternatives, staying sharp longer across abrasive materials like aerated concrete and laminates.
• 4-tooth carbide configuration - balances fast material removal with smooth bore quality, producing cleaner hole edges that reduce or eliminate the need for cleanup work.
• Right-hand rotation - matches the standard forward drive direction of cordless drills, corded drills, and drill presses, so the saw engages immediately without setup adjustments.
• Hexagonal shank interface - locks securely into compatible arbors without slipping under torque load, giving the operator full control during high-resistance cuts through brick or dense wood composites.
• Multi-purpose design - cuts wood, plywood, MDF, laminates, plasterboard, plastics, bricks, aerated concrete, and soft tiles from a single tool, reducing the number of hole saws needed on the job site.

Why This Product

• The HW-grade carbide construction makes this hole saw a practical choice for mixed-material projects where a single saw must transition between wood products, masonry, and plastics without swapping tools or losing cutting performance.
• At 60mm of usable cutting depth, this saw handles thicker substrates - such as doubled framing, composite panels, or insulated wall assemblies - that shallower hole saws cannot reach in one pass.
• The 3-1/8 in. (79mm) diameter is a commonly specified size for electrical boxes, plumbing rough-ins, and HVAC penetrations, making this a frequently-reached-for tool on residential and commercial construction sites.
• The four-tooth carbide geometry is purpose-designed for versatility across hard and soft materials, meaning tradespeople working in renovation or multi-trade environments can carry one saw instead of several specialty cutters.

Specifications

• Manufacturer Part Number: 550-079X
• Brand: CMT Orange Tools
• Diameter: 3-1/8 in. (79mm)
• Cutting Depth: 60mm
• Number of Teeth: 4
• Blade Material: HW (Tungsten Carbide-Tipped)
• Rotation: RH (Right-Hand)
• Shank: Hexagonal

Approved Applications

• Hole cutting in wood and plywood
• Hole cutting in MDF and laminates
• Hole cutting in plasterboard
• Hole cutting in plastics
• Hole cutting in bricks and aerated concrete
• Hole cutting in soft tiles