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

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