Review on Secure Your Pins With EuTengHao 30 Piece Gold Locking Pin Backs - 9Mmx5.5Mm Keepers by Brian Gordon

These pin keepers worked as expected. It came in two separate ziplock bags (with an alen key in both) inside a whit bag. Use these to keep my pins from falling of my back pack as a commute to work a motorcycle. Haven't lost a pin even at highway speeds. I did place a small dot of blue threadlocker on the set screw before installing it (not to much as it might cause the set screw to strip or alen key to round off during removal).Instalation Tip: install the black set screw (1-2 turns) into keeper before placing on pin.