Superior Strength with Ergonomic Control. Set the blade to any cutting depth with the OLFA 25mm NH-1 Rubber-Grip Ratchet-Lock Utility Knife. The ratcheting-lock system secures the blade with the turn of a wheel for extra heavy-duty applications including construction and remodeling. This utility knife is built for continuous hard work with a durable stainless-steel blade housing that maintains a long life of steady cutting. The anti-slip rubber grip adds ergonomic control in an acetone-resistant handle. This knife comes preloaded with a 25mm HBB Extra Heavy-Duty Ultra-Sharp Black Snap Blade that is up to 25% sharper than standard silver blades. Each blade contains seven (7) cutting edges for efficient, volume cutting. A simple snap of the segment reveals a fresh edge. Full blade changes are quick and without need for additional tools. Cushioned, rubber-grip handle. Acetone resistant. Ultra-Sharp Black Snap Blade. Stainless-steel support channel. Tool-free blade change