Are you looking for an easy and economical way to fix pinhole leaks, cracks, kinks or rub throughs in your air conditioning, coolant, transmission, oil or fuel lines? Look no further than 4Lifetimes' 5/8" Air Conditioning Repair Clamp. This compression style tube repair clamp is designed to allow for fast and efficient repairs that are permanent and can be used on steel, aluminum or copper lines with standard hand tools - no special tools needed. Not intended for use in brake or clutch systems.