Extra heavy-duty HandSaver® cutter features a cushion grip handle, ratchet wheel blade lock to prevent slipping, and rope loop. The extra heavy-duty cutters are the largest knives of their kind available in the market. Perfect for cutting through difficult materials. The NH-1 also features an acetone resistant, elastomer handle with a poly-acetate locking mechanism, making it an official acetone resistant cutter. Guaranteed Forever. Uses Replacement Blade HB. Suggested Uses: cutting drywall, roofing, leather, rubber, plywood, etc.