This is a simple bracket for installing a 2.5" hard drive or SSD in to a 3.5" bay. It is a somewhat minimal design. Designed to be relatively cheap without being overly flimsy. With the price of my material, it costs about 50 cents CAD.
Note that this is shorter than a normal 3.5" hard drive. There are certain (somewhat rare) situations where you need the entire length, and all three standard holes. For this scenerio, I have a longer bracket that can be found at https://www.thingiverse.com/thing:4151949
I also have my "deluxe bracket" which allows you to install two 2.5" drives in a single 3.5" bay, or one 2.5" drive and a fan. This bracket can be found at https://www.myminifactory.com/object/3d-print-111940
The holes on the side of this bracket should allow you to self tap a #6-32 UNC screw. (The standard ones that are used with 3.5" hard drives, not the M3 screw which has a finer thread and is generally used for optical drives and 2.5" drives - although if you find the hole too small for the 6-32, you could try an M3.)
Please tip if you can afford it and this is useful to you :)