Cuts string, line and twine up to .25" in diameter. Designed to mount on wall or other stationary work surface. Blade spring mechanism allows cutter to adjust itself for each operation. Features a unique safety guard that completely surrounds the cutting edge. This item is a substitute to the Lewis K630 String Cutter that has been discontinued. Includes three S-17 blades. Additional blades can be ordered here... S-17 Blades