An OTF (Out-the-Front) knife is a type of folding knife that has one side with an extended blade which can be released from the handle and retracted after use. The dimensions of an OTF knife depend on its size, with smaller ones typically being around 4 to 6 inches long while larger models may reach up to 8 or 10 inches in length. In terms of width, they usually range between 1 and 2 inches wide, although some variations may be slimmer. Additionally, the thickness of an OTF knife depends on its purpose; if it is intended for self-defense purposes then it will likely have a thicker blade than if it were used as a pocket tool or utility knife. Ultimately, when considering the dimensions of an OTF knife, you should take into account both its length and width to ensure that it meets your needs.