The OLFA® Ergonomic Rotary Cutter, 45mm is the most popular size and handle. This ergonomic cutter features Ergonomically curved handle with anti-slip rubber grip reduces hand fatigue and stress and integrated grooves help prevent finger slippage. Dual action safety lock; cutter can go through multiple layers of fabric at once. Designed for both right and left handed use. Lifetime Guarantee Auto Retract Blade for safety.