Rear to top mounting, does not work with Solo seats or side mount seats. Knurled sides for easy installation and quick release, no tool required for installation and removal. Tab covers are designed to protect your chrome and lock the securley screws. Not for side or nut mounting. Not for nut installation-like Solo double sockets. Brand new Screw size: 1/4-20 inch thread Screw material: aluminum screw with knurled sides. Easy to install, instructions are not included. Fitment: For all models, rear mount 1996-2015.Na 1996-2015 Sportster, Wide Glide, Street, Roadking, Fatbob, Streetbob, Softail, , Street Traveling, Road Glide, Ultra Glide, Touring and other model with 1/4-20 threadColor: Silver Material: Aluminum Package Content: 1 * Rear Screw Only the above package content, other products are not included. Note: The light and different displays may cause the item's color a little different from the real one