The OLFA 18mm Ratchet Lock Utility Knife features a durable ABS plastic contoured handle for all-day comfort, The ratchet-style blade lock secures the blade in place, A stainless-steel blade channel supports the length of the blade for powerful cutting, These ratchet-lock snap knives come preloaded with a tough Silver Snap Blade, Each blade has eight (8) deep-etched grooves to provide a new blade in seconds, For a fresh edge snap off the used section and keep on working, Package of 4.