Capacity: 1/8~5/8"(3-16mm), 3/16~15/16"(5-24mm) & 1/4~1 1/8"(6-28mm) . Designed for use in restricted spaces on small diameter, hard and soft copper, aluminum, brass, and plastic tubing. Strong, lightweight slide and wheel housing, large knurled feed screw knob gives easy control of cutting pressure for clean cuts.