This knife makes loading a fresh blade a snap. The blade has eight segments that can be snapped off as the cutting edge becomes dull. Designed for heavy-duty cutting, it may be used on carpet, wallpaper, dry wall, vinyl, foam board and all your heavy-duty cutting needs. It has a built-in attachment to snap off worn blades. It contains two replacement blades in the handle's storage compartment. Details:For heavy-duty cuttingAdjustable carbon steel bladeRatchet locking system prevents the blade from slippingPractical