1/4"-20 Thread Harley Davidson Billet Aluminum Seat Quick Mount Bolt Screw Cap With Knurled Sides BLACK Material: Aluminum seat bolt with knurled sides Diameter of the screw: 19mm Thread Size: 6mm (W) x 15 mm (L),Total length: 32mm Fits:1996-2015 Harley Sportster, Wide Glide, Street Bob, Roadking, Fatbob, Streetbob, Softail, Dyna, Street Glide, Road Glide, Ultra Glide, Touring and other model with 1/4"-20 thread color:black