- 46 variable pitch teeth for reduced noise and improved performance
- Backed by the IRWIN lifetime guarantee. Made in the USA from global components
- Bi-metal construction for toughness and long life
- Electron beam weld for stronger, longer-lasting teeth
- Variable depth gullets provide more efficient chip clearance
![Irwin® Bi-Metal Hole Saws, 4", 2" H x 5 1/2" L, #IR-373400BX (1/Pkg) Irwin® Bi-Metal Hole Saws, 4", 2" H x 5 1/2" L, #IR-373400BX (1/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/259130/449163/373400BX__36186.1669666789.jpg?c=2)