4 Inch Hole Saw, M42 HSS Bi-Metal Hole Cutter with Arbor, Triangular

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4 Inch Hole Saw, M42 HSS Bi-Metal Hole Cutter with Arbor, Triangular Shank Hole Saw Drill Bit with Spring for Wood, Plywood, Plastic, Gypsum Board, Various Thin Metal Sheets Description Style Industrial Color Red Set Name 4 Inch Hole Saw Set Brand EMSTAR Material High Speed Steel Item Weight 0.32 Kilograms Number of Teeth 4 Product Dimensions 4"L x 4"W Size 102

• 4 INCH (102MM) DIAMETER – Perfect size for downlights, electrical boxes, door locks, plumbing access, and HVAC ductwork. One of the most commonly used sizes for residential and commercial projects
• M42 BI-METAL WITH 8% COBALT – Premium M42 high-speed steel teeth with 8% cobalt content for exceptional hardness, heat resistance, and wear resistance. Cuts through stainless steel, aluminum, thin metal sheets, wood, plastic, and drywall
• TRIANGULAR SHANK FOR SLIP – Triangular shank design provides positive engagement in drill chucks, preventing slippage under heavy torque. Delivers maximum power transfer for consistent performance on tough materials
• SPRING EJECTOR FOR AUTOMATIC SLUG REMOVAL – Integrated spring automatically pushes cut waste out after drilling, eliminating manual cleanup. Allows continuous cutting, reduces downtime, and protects teeth from debris buildup
• COMPLETE WITH ARBOR & PILOT BIT – Ready to use right out of the box. Includes high-quality arbor and pilot bit for accurate centering and wobble-free starts. Quick-change design for easy attachment and removal

The 4 Inch Hole Saw is a professional-grade cutting tool engineered for fast, clean, and precise holes in a wide range of materials. This 102mm bi-metal hole cutter features M42 high-speed steel teeth with 8% cobalt content, delivering exceptional durability and heat resistance for demanding applications. Designed with a triangular shank for slip-free power transfer and a spring ejector for automatic slug removal, this hole saw is ideal for woodworking, electrical installations, plumbing, and metal fabrication. Complete with arbor and pilot bit, it's ready to use right out of the box.

4 Inch (102mm) Diameter for Versatile Applications

The 4-inch (102mm) diameter is one of the most commonly used sizes for residential and commercial projects. Perfect for:

• Electrical Work: Cutting holes for downlights, recessed lighting fixtures, and electrical boxes
• Plumbing: Creating access holes for pipes, fittings, and drains
• Door Hardware: Installing door locks, deadbolts, and handles
• HVAC: Cutting openings for ductwork and ventilation grilles
• Woodworking: Drilling holes for furniture assembly and cabinetry

M42 Bi-Metal Construction for Superior Durability

Each hole saw is crafted from M42 high-speed steel (HSS) with 8% cobalt content, providing exceptional hardness, heat resistance, and wear resistance. The bi-metal construction—combining cobalt-enriched cutting teeth with a flexible alloy steel body—allows the saw to maintain sharpness even when cutting through tough materials like stainless steel, aluminum, and thin metal sheets. The spring steel backing provides flexibility that reduces stress on the teeth, preventing breakage and extending tool life.

Triangular Shank for Slip-Free Power Transfer

The hole saw features a triangular shank design that fits securely into most standard drill chucks. Unlike round or hex shanks that can slip under heavy torque, the triangular profile ensures positive engagement, delivering maximum power transfer without slippage. This design is especially valuable when cutting through hard materials or when using high-torque impact drills, providing consistent, reliable performance.

Spring Ejector for Automatic Slug Removal

An integrated spring ejector automatically pushes the cut slug (waste material) out of the hole saw after drilling, eliminating the need to stop and manually remove debris. This time-saving feature allows for continuous cutting, reduces downtime, and prevents damage to the cutting teeth from accumulated waste. Simply drill through the material, and the spring pops the slug out—ready for the next hole.

Complete with Arbor and Pilot Bit

This hole saw comes complete with a high-quality arbor and pilot drill bit. The arbor features a standard shank that fits most cordless drills, impact drivers, and drill presses. The pilot bit ensures accurate centering and prevents wandering during initial drilling, guaranteeing precise hole placement every time. The quick-change design allows for easy hole saw attachment and removal.

Versatile Applications Across Multiple Materials

This bi-metal hole cutter is ideal for a wide range of materials:

• Wood: Softwood, hardwood, plywood, MDF, particle board
• Metal: Stainless steel (up to 1/8"), aluminum, brass, copper, thin gauge steel
• Plastic: PVC pipe, ABS, acrylic, polycarbonate, fiberglass
• Drywall: Gypsum board, plasterboard
• Laminate: Countertops, flooring, and composite materials

Recommended Usage Tips

For best results and extended tool life:

• Use low speed (300-500 RPM) for metal – Apply cutting oil to reduce heat and extend blade life
• Use medium to high speed (800-1500 RPM) for wood – Apply steady, even pressure without forcing
• Use medium speed (400-700 RPM) for plastic – Avoid excessive speed to prevent melting
• For stainless steel – Use cutting oil and slow speed; let the tool do the work
• Clear chips periodically – Remove debris from teeth during extended cuts to prevent clogging

What's Included

• 1 x 4 Inch (102mm) Bi-Metal Hole Saw
• 1 x Arbor with pilot bit
• 1 x Spring ejector (pre-installed)
• Triangular shank design

Quality Assurance

Each hole saw is precision-machined and individually inspected to ensure sharpness, concentricity, and consistent performance. Backed by a satisfaction guarantee for worry-free use.

Whether you're a professional electrician, plumber, contractor, or DIY enthusiast, this 4 Inch Hole Saw provides the cutting power, precision, and durability you need for clean, fast holes in any project. Add it to your toolkit today and experience the difference of M42 bi-metal performance.

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