The Malco HSB4125 4-1/8" Bi-Metal Hole Saw is engineered for professionals who demand consistent, clean cuts across the most common jobsite materials. With a high-speed steel cutting edge and a flexible alloy body, this 4-1/8" (102 mm) hole saw delivers smooth penetration through wood, drywall, plastic, aluminum, and thin steel, while reducing vibration and chatter for accurate results every time.

• Bi-metal construction pairs a durable high-speed steel cutting edge with a flexible alloy body to resist cracking and tooth stripping, even during repeated use and rough-ins.
• Variable tooth pitch minimizes binding and chatter, ensuring cleaner holes and faster progress across diverse materials.
• Wide material compatibility designed for HVAC penetrations, electrical and plumbing openings, drywall and sheet metal work, and general carpentry tasks.
• Precise, repeatable results delivers clean, accurate holes day in and day out, reducing rework and improving installation quality.
• Easy compatibility works with Malco Quick Connect arbors and Quick Change pilot drills (HHA4 Arbor with High Speed Steel Pilot Drill Bit or HHA5 Arbor with Carbide Tipped Pilot Drill Bit).

Ideal for professionals tackling conduit runs, duct penetrations, electrical boxes, plumbing penetrations, or sheet metal work, the HSB4125 is built to handle your daily installs with dependable performance. You’ll appreciate the controlled cutting action, minimized vibration, and durable construction that stands up to the demands of busy job sites.

Choosing the Malco HSB4125 means opting for a tool that maintains precision across materials, reduces the need for rework, and keeps your workflow efficient. When you need a reliable 4-1/8" bi-metal hole saw for wood, drywall, plastic, aluminum, and thin steel—this is the choice that professionals trust.