This is a utility knife designed by Blackie Collins, a designer from Gerber's golden age. The blade doesn't slide, but can be flipped over for use. (The blade is a type with two valleys, unlike the common hole-punched type in Japan; it might be easier to find at imported tool stores.) I removed rust from the side of the blade with a rubber abrasive. Reinforced resin handle, folding type, integrated belt clip. It excels in lightness, and the handle is easy to grip and apply force.