Spyder Rapid Core Eject arbor system containing 11 carbide-tipped holesaws to remove cores without prying. Offers versatile use and cuts up to 5x faster than standard bi-metal hole saws. Quickly enlarges existing hole diameters and also cuts at an angle. Suitable for muiltiple materials including MDF and some types of brick. Cuts Aluminium, Ceramic Wall Tile, Fibre Cement Board, Non-Ferrous Metal, Porous Concrete Block, PVC, Plastic & Wood Steel Slotted Barrel to Aid Removal of Debris 35mm - 114mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action Cuts Aluminium, Ceramic Wall Tile, Fibre Cement Board, Non-Ferrous Metal, Porous Concrete Block, PVC, Plastic & Wood Steel Slotted Barrel to Aid Removal of Debris 35mm - 114mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action