4 Pack Black Chassis Hard Drive Mounting Plastic Rails Durable Anti-Scratch HDD Mount Rails for Desktop Computer Cases Easy Install Drive Bracket Accessories for PC Building Upgrades

I'll preface my review with saying that I wasn't aware these were Cooler Master branded hard drive mounting rails. The product images on Amazon confirm this upon further analysis. I bought these expecting generic china mounting rails, it was a nice surprise to see the CM logo on them.The rails themselves are nice, have rubber mounts for the screws and seem high enough quality for it's purpose. However, beware the included "screws"! They aren't screws at all!The included mounting "screws" have no philips engraving for use with a screwdriver, nor do the "screws" actually have any threading to them; they are threadless!Due to the way the included screws have been designed, they are essentially push pins that resemble smaller-than-usual thumb screws (again, no threads on them). To use these you must friction fit them into your storage drive by inserting them in the rubber screw holes. You have to press quite a bit for it to really seat in there and not back out. Not extremely difficult but if you use your finger/nail it is discomforting and not the easiest.To mount the rails and included screws to your drive I would recommend using a simple pen like I have shown in my product images. That should give ample leverage to seat the mounting pins in securely and easily.To summarize my review, I think the plastic rails themselves are okay and will certainly get the job done. I am not unhappy with my purchase, however I think for the money the mounting pins that are included are somewhat disappointing. They are technically "tool-less", but are slightly finicky and due to their design I think the only way to remove the mounting pins is going to require pulling the plastic rails and hoping it pulls the pins out with it.I am giving this product 5 stars out of 5 stars, mostly because I will likely purchase another set of these in the future and there is no critical design flaw that would stop you from using actual screws. I would like to see this product be a dollar or two cheaper though.While the product gets 5 stars, the ease of use and installation gets only 4 due to the mounting pins.

Not much to say they pin into the side of your HDD's and they hold them to slide in to lock in place. They haven't broke, they don't have an issue locking into the track. They are priced well. They are not too thick for any tracks but are not thin to break at the same time

They really should have included the proper screw instead of pins. Luckily, I have plenty left over from older computers.

It worked perfectly well for me.

If your computer case is made to use these types of rails for easy hard drive adding/removal, then these are very good rails. They fit well and it's easy to put a new drive in or remove one with them. The rails were delivered on-time and are as described. I would buy them again if I needed more rails.Oh, on the star rating above, I have no idea what "sheerness" means in this context, but that should not detract from perfectly good rails.

Read reviews and found it was actually the maker of the case I had. It fits the hard drive perfectly and holds it in place. I also read the "screws" aren't screws, which they aren't. Instead of trying to push them, as the reviewer did, I was able to find actual screws I had left over from numerous other builds that fit and worked as I wanted them to.

The rails are fine, but received only four friction fit mounting pins. Photos show two pins per rail, pre-mounted. Hard drive is not secure with only one pin per rail. Could have used screws, but that defeats the purpose of the quick mount these rails were designed for.

The rails were exactly what i needed to install additional drives to the system. The only issue was that they were too long at the end and stuck out just far enough to prevent the side panel from closing properly. I trimmed them down to just remove the tiny rounded end and it fits perfectly now. Not a con in my book because they still work exactly as i need them to.