Wouldn't it be nice if you could roll your doors with very little effort and they glided smoothly across the track without all that noise? Are you bothering your neighbors below (in condo's) when you open and close your doors because your track isn't in good shape? SliderMan knows that the soft aluminum rail that the door rides on can become damaged by an old wobbly roller. Because this original rail that the roller connects with is made out of a soft aluminum it will eventually break down and give off a black powder (graphite) over time and with use. Sometimes you will get a small dip or ripples in the rail and the more you use your door back and forth over it the worse it will get. Before you know it you have a lot of black in your track and you are in need of stainless steel rail cap to refurbish you rails back to better than brand new. This can be done for most brands of doors. Our stainless steel rail cap is applied like a sleeve right over your existing damaged rail with a sound deadening adhesive. It comes in 6ft, 8ft, 10ft & 12 foot lengths and if we are repairing a longer rail our expert technicians know just how to make seemingly seamless seams and you only pay for the footage we use. Typical rail cap runs 4$ per foot installed and makes a brand new smooth surface for your rollers to ride on and when paired up with your new rollers we get phenomenal results.