I bought two, and on both, the bottom end cap basically came off in my hand. The upper seemed okay. Since it's got a magnet, when in the tool box drawer, the cap just slides off instead of holding the rail in place. (The end caps are the only part of the bottom side that is magnetized). The manufacturing molds look worn out and mended many times, so while it may have been good with new molds, the way it is now it won't function to keep the end cap in place. The molds for the clips didn't look grSee full review