Auto-retracting blade safety knife for both right and left-handed users. The knife features a powerful return spring, stainless steel blade channel and ergonomic grip eliminating injuries while working. It is perfect for cutting corrugated cartons, boxes, paper, cartons and all other types of packaging materials. The knife also has a tape slitter at the back to easily get into cartons.No tools required for blade replacement. Anti-Acid and Aceton.