The Jakar Mount Cutter Kit enables you to cut both 45 and 90 degree angles in materials up to 7mm thick. The mount cutter is attached to a sturdy 40cm aluminium ruler. When you want to cut at a 45-degree angle, place the ruler on the outside of the aperture; for a 90-degree angle, place it on the inside of the aperture. You'll find the Mount Cutter Kit useful for cutting cardboard, leather, paper or vinyl. It includes three spare mount cutter blades.