Spring-retractable safety cutter made from durable, high-impact ABS plastic for prolonged life.. Features a heavy-duty spring-activated blade that automatically retracts the instant the blade loses contact with the cutting surface, reducing injuries in the workplace. Features a slip-resistant ergonomic handle and stainless steel blade channel that holds the blade tight. For right and left-handed use. Blade made of high-quality Japanese grade carbon tool steel and designed for unparalleled sharpness and superior edge retention. Fits SKB-2, RSB-2, HOB blades.