RAM® Square Post 夾具底座 適用於寬達4英吋的柱子（不含五金件）

I needed a secure mount for a 4-inch railing, and the 1.5" rubber ball grips firmly without slipping. The clamp base feels solid, though you’ll need to grab your own bolts since hardware isn’t included.

Installed this on a 3.5" square rail and the rubber ball clamps down securely with no slipping. The fact that it fits up to 4" width without needing extra hardware saved me a trip to the hardware store.

I needed a sturdy base for my boat rail, and this clamp fits perfectly on posts up to 4 inches wide without any hardware hassle. The 1.5-inch rubber ball grips tight and holds my device steady even on bumpy rides.