OLFA SK-4 Safety Knife is a heavy-duty, self-retracting utility knife designed to improve cutting safety in industrial and warehouse environments. Its spring-loaded blade automatically retracts when not in use, helping reduce the risk of accidental cuts and injuries. Built with a durable, ergonomic handle for comfort and control, it is ideal for cutting cardboard, shrink wrap, packaging, and other common materials in shipping, fulfillment, and maintenance applications.