This knife features a retractable blade mechanism with a ratchet-wheel for secure blade extension and retraction and unlimited blade positioning so that you can chose the depth that is right for you. It produces a very fine score line allowing for precise breaking of plastics and laminates. Suitable for right and left handed use, the knife includes three blades (one inserted in the handle and two in the handle storage area). Blades can be replaced with OLPB-800 replacement blades.Details:MulticolorKnife has 3 bladesReplaceable bladesSuitable for heavy-duty projects