Description: Diameter of mounting hole: approx. 6mm/0.23" Length: 98mm/3.85" Material: Steel; Color: Silver Easy to install; Installation Instruction NOT Included Use performance materials to increase durability and provide greater reliability Fitment: for Harley Sportster Nightster XL1200N 2007-2013 Package Includes: 1 Piece Rear Seat Mounting Bracket Note: 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3. Instruction is not included. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you