Speed up your chain piecing with the sawtooth star thread cutter! Add an old rotary blade to the center and start separating your chains quickly. And doesn't it look nice sitting next to your sewing machine? Both the blade holder and base are reversible. Blade holder measures approximately 2.5 inches in diameter and 0.5 inches thick. Base measures 2 in across and 0.5 inches thick. Made from frosted fused acrylic, secured with a brass boston screw.