The 3M Hand-Masker Straight Cut Blade is designed to cut masking film with a durable, sharp, and stainless steel blade. Includes a plastic blade guard and has an assembly that attaches to the end of the roll to help provide a straight cut. Also available in 3M M3000 Starter Kits, it comes in 12 In. length. For use in painting projects when masking with the 3M Hand-Masker M3000 Dispenser to protect windows, doors, tub surrounds, railings and other surfaces.