Utility knives make pull cuts using small blades attached to the knife handle. They score drywall and insulation and cut cardboard, plastic sheeting, card stock, cord, and more. Fixed-blade knives set their blade in a rigid, exposed position to minimize blade wiggle and make precise cuts. Folding knives tuck their blade into a slot in the knife handle. Manually retracting knives use a push button, lever, or slide to extend and retract their blade. Safety utility knives automatically retract or cover their blade when the cut is complete. Snap-off knives hold a blade strip that snaps off in segments to remove worn cutting edges and expose sharp ones.