The Comfort-Grip Series features an anti-slip, rubber grip handle to provide all day comfort, extra stability, and user control. The 25mm Extra Heavy-Duty Comfort-Grip Utility Knife features an acetone resistant, elastomer handle with a nylon ratchet-wheel lock. This versatile cutter also has a heavy-gauge stainless steel blade channel to firmly secure the blade in place. The ratchet-lock allows for unlimited blade positioning. Just turn the wheel clockwise to lock for secure blade hold during pushing and pulling movements. Preloaded with a 25mm HBB Extra Heavy-Duty Ultra-Sharp Black Snap-Off Blade for more leverage on construction grade materials such as nylon, rope, high-pressure laminates, flexible plastics, expansion board, gasket materials, and more. Works with HB, HBB, HH, and HSW 25mm blades. (NH-1, #9043US) OLFA 25mm NH-1 Rubber Grip Ratchet-Lock Knife