Martelli Enterprises Ergo 2000 Rotary Cutter is ergonomically designed and precision engineered with a comfortable, contoured grip, and a spring-loaded blade guard. Blades are easy to replace, with a simple twist of a bolt. Great for those with arthritis, carpal tunnel syndrome, tendonitis, hand fatigue, neck and arm pain, and more. Caution: Blades are very sharp. Always handle blades with great care. Read Instructions before use. 45 mm Right Hand