You're looking at a brand new, fully adjustable swivel knife, with a quality Japanese made blade.
This old favourite is the same type that's been proven to work over the years, but made in Japan to the highest quality. When measured from the bottom of the finger cup to the end of the barrel, the maximum length fully extended is 65mm and the minimum when fully collapsed is 53mm.
This swivel knife is compatible with Tandy and other standard blades. Great for carving intricate patterns in your leather with the blade of your choice.