Hole saw made of top HSS & Bi-Metal for Heavy Dusty capability improved durability with Rust-proof. Drilling with sharper Positive Rake Tooth cuts material faster than other brand. The 4" hole saw fits universal Mandrel such as Lenox, Dewalt, Milwaukee and Bosch. 38mm depth of hole saw help to cut 2x material in 1 pass. This 4 Hole Saw Blade is design for drilling metal sheet, drywall, plastic pipe, wood, PVC, fiberboard, grommet hole, recessed light and can light hole Drilling.