Olfa Cutter A-5 One way lockThe A-5 makes cutting safer with a revolutionary One-Way Blade Locking system, which firmly locks the blade in place for pulling in one-direction only. Equipped with an ExcelBlack blade, the A-5 is becoming popular worldwide because of its outstanding cutting performance. The handle has a very attractive contour, but more importantly you will be pleased with the comfortable grip and how it fits your hand.