Our 40 series base bracket will fit round rails 7/8" – 1" with the supplied clamp and fit up to 1-1/2" rails with a larger clamp. This extremely versatile fitting can be mounted vertically or horizontally. Use it to mount: Solar panels, drink holders and other accessories on your boat. The two outer holes are tapped for 10-32 fasteners on 1" center and the middle hole has a clearance for 1/4" fasteners.
