These are PCIe- Riser locks that help prevent your riser from coming dislodged on your mining rig. They work with most motherboards and comes in a pack of 16.
You wont have to troubleshoot that graphics card for hours, just to realize your riser slid out slightly and now you lost out on profit from mining.
It is better to be safe that sorry AND these are fully reusable as well.
MADE IN THE USA with PLA using 3D Printing technology.