Superior Engineering rear coil drop out cones are a weld in part that fits snuggly under the rear coil hats. Using these items will allow a longer shock up to 4 inches longer to be used, as the coil will be able to drop down approx 4 inchs below the top coil seat before they will fall out. It is recommended to fix the bottom of the coil to the diff using coil retainers when using drop out cones. The drop outs are a weld in item and are sold as a pair.