Extra heavy-duty utility knife is a powerful anti-slip utility knife, featuring a professional grade fiberglass rubber grip for maximum comfort and control. Heavy-gauge stainless steel blade channel protects and holds blade tight, ratchet-wheel blade lock for unlimited blade positioning. Acetone resistant handle for easy cleaning. Easy, tool-free blade change. Includes the double-honed UltraSharp black snap-blade, 25% sharper than the silver OLFA HB blades. Made of high-quality Japanese grade carbon tool steel and designed for unparalleled sharpness and superior edge retention.