Ideal DTC-45-074 Data T-Cutter is the perfect tool for installation needs and uses.  

Tool Features:  Cuts round communication cables up to 0.5 inch (12.7mm) and coaxial cable up to RG-9/U Curved cutting blades maintain cable geometry for better cable performance Steel reinforced center conductors can be trimmed with bolt cutting holes Cushioned comfort grip handles Locking latch keeps tool closed in pouch