Tube Cutter,1/8" to 1-1/8" Cutting Cap. From the Manufacturer P&M is a professional tube cutter precisely cuts copper tubes 1/8" - 1-1/8" OD. Smooth-running telescopic action provides a consistent working radius and advances the blade faster than other tube cutters. PLUS cutters feature a arge,ergonomically designed knob which is easier to turn.