The OLFA TK-4 Multi-Purpose Touch Knife is a convenient small size, perfect for carrying in your pocket, apron, or keeping at your desk. Utilize this disposable, key-chained sized tool for opening carboard boxes, letters, polybags, plastic packaging, tape, and more. The stainless-steel blade stays sharp through volumes of cuts and automatically retracts when the slide is released. The small blade extends to 10mm with a simply push of the slide. Add this portable OLFA utility knife to your keychain or lanyard with the hang hole located at the base of the tool.