Designed to aid both the professional and the DIY carpet and flooring installer, this tool from Estwing combines the best features of traditional utility knives with the angled convenience and precision of specialty carpet knives. The patent pending sliding blade chassis allows for more than just different extension lengths, it also allows the blade to angle downward in the carpet knife setting for maximum extension and angle for better corner access and clearance. All this with the operation of a single sliding, position locking button for quick use whether as a box cutter, utility knife, or carpet knife. The ergonomic, dual durometer handle conceals onboard storage for up to 3 replacement blades and has a convenient push button quick change system to allow you to easily eject a dulled blade and replace it with a fresh, sharp one. Includes SK5 hardened steel, round corner carpet blades for convenience.