Designed to slit and ring fiber optic cables from 1.2 mm to 7.5 mm (0.05 to 0.3) in diameter, this cable slit and ring tool is perfect for slitting and ringing cables, buffer tubes, and jackets on fiber optic cables. This cable slit and ring tool features the following: Blade depth is easily adjustable Spring-loaded design for easy operation V block is reversible to be able to hold smaller (1.2 mm to 3 mm diameter) or larger cables (3 mm to 7.5 mm diameter)