Use on Wire from 0.35 to 0.50. Good for Cannon Ball Termination or to hang a Bird House or Bird Feeder Heavy Construction for weight up to 150 kg or 340 lbs.  Double Crimps for improved weight retention. All products Stainless Steel or Aluminum Stainless Steel Spring Compression Spring for use with any pulley system (ie) Downriggers.  With 50lb of compression.