Milwaukee hole dozer bi-metal hole saw 3-1/2in is a cutting tool designed for fast, clean holes in metal, wood, plastic, and other materials. Its bi-metal construction, reinforced teeth, and Plug Jack™ slots provide long-lasting performance, easy plug removal, and reliable cutting. The Thermoset coating helps reduce friction and improve cutting speed. • 3-1/2in diameter bi-metal hole saw. • 3.5 TPI tooth configuration for long cutting life. • Plug Jack™ slots for fast and easy plug removal. • Thermoset coating reduces friction and heat buildup. • Reduced tooth breakage.