BN-Sliding door hardware kit KB112239

Sliding door hardware kit(size:4ft) Main Material: High quality carbon steel .Black frosted, corrosion protection The distance from the top of the door to the ceiling should be at least 6 inches Fit for door panel thickness:1-3/8" to 1-3/4".Door Max Weight:220lbs Usually, we recommend the track length should be at least 2 times the doors width or the opening.For example, if the door is 30'' wide. You will need 2 * 30'' = 60'' long track. Or if you have an opening that is 30'' wide, you will need at least 60'' long track. All tracks are pre-drilled holes, the spacing between each hole is American standard 16''. Tracks 7.5 FT and under are one complete track, 8 FT and above are connected by multiple shorter tracks, There are connection holes to expand the track at the end of both sid...