Crain 247 Multi-Purpose Wall Trimmer has a rounded wall runner which allows it to trim vinyl sheet goods net to the wall. The tool can also trim cut pile carpets. When trimming vinyl, the tool comes with an anti-friction boot to prevent it from scratching. Crain 247 Multi-Purpose Wall Trimmer has a spring-loaded center knob for height adjustment is easy to use. Takes either slotted razor blades or hook blades. Slotted razor blades work well on vinyl, while hook blades work well on cut pile carpet. Blades: No. 308 Slotted Razor Blades or No. 996X Hook Blades.