About this item

Round Base Rubber Coil Spring Booster is used for increasing spring rate
Excellent way to boost your load capacity in most vehicles.Provides quick and easy way to increase spring rate for fast or rough tracks
Can be cut to shorter length for minor spring rate changes
Fit for:Works with 5" and 5.5" O.D. coil springs，Universal; 1" Lift
Package include : 1 pcs Round Rubber Coil Spring Spacer
Install was pretty easy, although it's necessary to take off the tire. Grease the spring and the booster up real good and just shove it in there, thread it down the spring until it can't go anymore and that's it. 5 minutes per side.
This rubber coil is very flexible. The inside groove from top to bottom is 1 inch, and the diameter in the groove is 6 inches.Part number: 18-1901

Universal Coil Spring Booster