45mm Ergonomic Rotary CutterA rolling razor blade that's perfect for all of your sewing and quilting needs. Sharp enough to cut through more than 6 layers of fabric, making quick work of your strip, block, and pattern cutting. Comfortable ergonomic handle reduces hand and wrist fatigue, and dual action safety lock allows the blade to lock open for comfort and closed for safety. Blade is made of high quality tungsten carbide tool steel for unparalleled sharpness and superior edge