Fiskars 45mm Rotary Blades (5 ct)High grade, precision ground, 45 mm premium steel rotary blade for long lasting sharpness Curved, loop handle design provides a natural fit for your hand, improves control and lets you keep the cutter in hand while you rearrange materials Sliding button extends blade during use, locks it into position and retracts it for safe storage Ideal for cutting multiple layers of fabric, paper, felt and vinyl, the blade can be assembled to either side for both