*Images are for reference only, the actual product may vary. CREATED TO REMOVE ANY TILT FROM A STACKED SPRING SETUP. Sold Individually Adapters sold seperately MAINTAINS STACK ALIGNMENT.ELIMINATES SHOCK DAMAGE.SMOOTH TRANSITION THROUGH STROKE. Made out of a heat resistant self lubricating composite. Our Stack Guides are designed to take out any tilt from a stacked spring setup. It has shown to deliver a smoother transition of the intended spring rate, as well as eliminates any chance of shock damage. A must for anyone using a dual rate or stack setup. PART NUMBER Dimension SSB188-100 ID1.88" x 10" SSB250-120 ID2.5" x 12" SSB250-140 ID2.5" x 14" SSB250-160 ID2.5" x 16" SSB250-200 ID2.5" x 20" SSB2550-180 ID2.5" / OD5.0" x 16"~18" SSB500-130 OD5.0" x 13" SSB500-160 OD5.0" x 16" SSB500-200 OD5.0" x 20"