As it says in the title, these are good value for money if you only need something that won't be "abused" too much and it's not worth spending lots of money on a case you could drive over.
These are a very good depth for A&H GLD AudioRacks.
These feel like quite a light corrougated plastic sort of material but they are strong enough to protect equipment from light bumps.
Unfortunatley one of the racks I received only had 6 nuts in one side of the the rail rather than 8, so only 3 units could be mounted. This wasn't a problem for me as I only had to install one 3U unit in it so I only needed 2 nuts per side. I also got another one and this has 8 on both sides, so probably not a common problem.
These did come with a full set of rack screws and nylon washers. This is very thoughtful as it prevents scratches on your equipment. You only need a screwdriver to install your equipment. :)
The lids from these are good for propping up monior wedges to get different angles too :)