SAFETY CABLE TECHNI-LUX
Your choice of Black or Polished (18" or 30") Safety Cable with lock. Every fixture that hangs overhead should always be equipped with a safety cable. In the event that a clamp should fail or be improperly tightened a fixture could fall from the ceiling or truss and possibly cause personal injury or damage to equipment. It's the least expensive form of insurance and can ward off costly law suits or pre-mature show closure.
S&H from $3.99 in continental US (e-mail for international rates)