RAM® 方形立柱夾具底座 (適用於寬度達 2.5 吋的立柱) - B 尺寸

Bolted this onto a 2.5" square post for my tablet holder and the 1" ball hasn't budged a millimeter, even on bumpy gravel roads. The clamp opens wide enough that I didn't have to shim anything, which was my main worry. Exactly the sturdy base I needed for the B size system.

I was a bit worried about the fit on my 2-inch post, but the clamp adjusts easily and the 1-inch ball gives me plenty of positioning options.

Finally, a mount that actually grips my square tube rack—the clamp opens wide enough for a 2.5-inch post without slipping. I’ve been using it with a tablet holder for a week and the 1" ball joint hasn’t budged, even on bumpy roads.