Convenient but average quality, poor value for money

Steel is good (very hard) but can easily scratch the wood if you do not put small rubber pads (which also prevent slipping).
It is provided with 2 runners, great to put in the front of the base and a little behind the lip in contact with the phone. Only the latter is not used much (no real risk of scratches), however the only place that would need to avoid scratching the office, namely the rear end of the media, is not protected.

So I took the small pad and I put it straddles the back to protect the office, but the glue is not strong enough and it takes off, as it is folded in half. I stuck to superglue to hold it (but it inevitably adds some skating ...).