Designed to be used only with the Z - 3571 Twisted Snare Wires. The wire is drawn in by turning the wing nut and the loop can be stopped at any point. Wire is held by ratchet so that the loop can be slipped down the nerve before enucleation. Overall length: 146mm, 5.6 inches. Comes with one package of Z - 3571 Twisted Snare Wires.