Personalize your ride with a little anodized bling from Niner. The Niner Bolt On Seat Post Clamp comes in two popular sizes and six anodized colors, so you can identify your ride in a snap when it's in the post-ride lineup. The Niner Seat Collar is CNC-machined from a block of lightweight, durable aluminum. The collar bolt is steel. The Niner Bolt-On Seat Post Clamp comes in 29. 6mm and 35mm diameters and is available in Blue, Black, Red, Orange, Green, and Silver.