The Low Profile Quick Release Picatinny Rail Mount is a 60mm long and 10mm rise mount that allows you to quickly remove or attach items to picatinny rail. Ideal for shorter optics/red dot sights that you want to raise to co-witness lower in the window or for items you want to quickly and easily remove from your rails without using tools. If you need to mount an item with a plastic mount (i.e. most vertical grips) the standard height quick release MT61172 is best.