Milwaukee Hole Dozer General Purpose Bi-Metal Hole Saw Set (21-Piece) Model # 49-22-4171 About This Product The MILWAUKEE 21-Piece HOLE DOZER Bi-Metal Hole Saw Kit features RIP GUARD, the strongest tooth form in the industry and is backed by a Limited Lifetime Tooth Break Warranty (an industry first). They've built the hole saw blade teeth with more steel behind the cutting edge for added strength.This added tooth strength combined with 8% cobalt, gives added life to the teeth, providing users with increased productivity on the jobsite, as well as consistent hole quality. This Milwaukee hole saw blade set includes Plug Jack, an all-access slot that provides access lower into the cup for thick material and higher towards the teeth for thin material for plug removal. The Plug Jack increases productivity and eliminates wasted downtime between holes with multiple positions to apply leverage and better plug access. Use Milwaukee's universal Quick-Change Arbors for fast, tool-free blade changes: 49-56-7240, 49-56-7250, and 49-56-9100. Highlights Thermoset Coating provides up to 2X Faster Cuts Bi-metal construction with 8% cobalt for increased wear resistance Rip Guard Limited Lifetime Tooth Break Warranty Drills through wood, plastic, aluminum, metal Includes: (1) 3/4 in. Hole Dozer Bi-Metal Hole Saw, (1) 7/8 in. Hole Dozer Bi-Metal Hole Saw, (1) 1 in. Hole Dozer Bi-Metal Hole Saw, (1) 1-1/8 in. Hole Dozer Bi-Metal Hole Saw, (1) 1-1/2 in. Hole Dozer Bi-Metal Hole Saw, (1) 2 in. Hole Dozer Bi-Metal Hole Saw, (1) 2-1/8 in. Hole Dozer Bi-Metal Hole Saw, (1) 2-1/2 in. Hole Dozer Bi-Metal Hole Saw, (1) 3 in. Hole Dozer Bi-Metal Hole Saw, (1) 3-5/8 in. Hole Dozer Bi-Metal Hole Saw, (1) 4-1/4 in. Hole Dozer Bi-Metal Hole Saw, (1) 4-1/2 in. Hole Dozer Bi-Metal Hole Saw, (1) 5 in. Hole Dozer Bi-Metal Hole Saw, (1) 3/8 in. Hex Shank Arbor, (1) 3/8 in. Large Quick-Change Arbor, (5) 3-1/2 in. Pilot Bits