The CMI Ropewalker accomodates from 7/16 - 5/8" rope and makes flipline adjustment quick and easy. Taking the device on and off is also simple with the built in ball detent pin keeper. The Arborist model features a bolt with lock nut for those who want a fixed type of connection. Huge selection to choose from. Using only the highest quality materials. Satisfaction ensured. Providing you with great selection and quality. Cmi Ropewalker Ascnder Ss.