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the box‑end design ensures superior torque transfer and fastener protection
UL Listed: Certified for safety and compliance in residential and industrial heating systems
Easy replacement: The adjustment rod is simple to install and align
Inlet/Outlet: 3/4" NPTF (inlet) × 1" NPTF (outlet)
Head Finish: Polished faces resist rust and corrosion
Hole Saw 4-1/8" (102 mm) Bi-Metal - Malco the box‑end design ensures superiorHSB4125 Malco 4 1 8" (102 mm) Bi Metal Hole Saw The Malco HSB4125 4 1 8" (102 mm) Bi Metal Hole Saw is engineered for clean, controlled cutting in larger diameter applications. Designed for HVAC, electrical, plumbing, and general construction professionals, it delivers smooth, accurate holes for duct penetrations, equipment clearances, and heavy duty rough ins. A high speed steel cutting edge paired with a variable tooth pitch allows the HSB4125 to
