OLFA heavy-duty circle cutter cuts uniform 3" to 12" diameter circles in materials such as thin plywood, carpet, leather, corrugated cardboard, matboard, rubber, and more, whether thick or thin. Blade and center pin are easily adjustable for depth according to thickness of materials. Built-in blade snapper. Adjustable pivot point for cutting through various thicknesses. Great for a variety of applications including scribing circles for recess lighting installation and cutting half-moon wind vents in signs and banners. Supplied with 1 LB snap blade. Uses LB6B, LB10B, LB50B replacement blades. OLFA lifetime warranty. OLFA #9902 snap off circle cutter knives are quality-made in Japan.