
These are solid rails. They didn't melt when I took my Dremel cutting wheel to adjust the length. I packed sets (SAE and metric) of 1/4 and 3/8 pockets with a combination key pocket. I can take the whole bag or just the size of the bag for a task. I pack in a separate bag both 1/2 SAE and metric bags for these heavy items. My tools are a mix of HF, Cobalt and Klutch as my job doesn't require high end items especially when they are disappearing from elevators, stairs etc. I need competent, affordable and interchangeable tools. perfect for replacing the metal spring clip that kept my sockets falling off and rolling around in bags. I know plastic ages over time, but I hope this allows the tuckbox to be worn for multiple seasons over multiple years. . The price of these splints justifies the risk. They feel great as I plug and unplug them into my outlets. Like other reviewers, I can turn them upside down and the outlets stay on. I hung a short 3/8 strip vertically with the heaviest rosette on top and they didn't slide on the rail. It doesn't bother me, just curious that there are no notches on the rails. I'm sure it won't be long as they wear out. It's just that after first impressions of the purchase I think I'll order more and set up my home kit/backup work kit the same way.

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