These are the MOD-ONE mini PC case feet for sized smaller builds. They are machined from high grade aluminum, and have a rubber insert at the base to protect whatever surface your PC sits one.
Four M4 screws and lock washers are included for mounting.
To mount these PC case feet, you need to drill a 5/32 (4mm) hole for each foot.
The feet measure at 29mm wide x 15mm tall.
Special note for CaseLabs Bullet owners; To avoid drilling a hole in your case, you can remove the stock threaded inserts that the stock feet screw into. To do this thread in a thumbscrew from the inside of the case about 2-3 turns, and rock the screw side to side with a pair of plyers, loosening the insert. The insert will eventually pop out leaving you with a hole to mount the feet.