Dewalt 10 Piece BIM Extreme General Purpose Holesaw Set. Contains 6 different size Bi-Metal Holesaws ranging from 20mm to 64mm, 2 holders with hexagonal shank and 2 centering points. Features and Benefits • Up to 2X Longer Life vs prior generation Dewalt Bi-Metal Hole Saws • Patented tooth forms optimize chip removal for efficient drilling and long life • Fast Plug Ejection • Large, continuous slot provides leverage for easy plug ejection and removal • Versatile Drilling Performance • High Speed Steel cutting edge effectively drills through wood, metal and plastic • Designed for Thick Materials • Deep hole saw design allows for cutting 2-by dimensional lumber in one pass Contents • Bi-Metal Holesaws: 20, 25, 32, 38, 51, 64 mm • 2 Holders with Hexagonal Shank • 2 Centering Points