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. Available in red, yellow, white, and navy.