RAM® 雙插座臂（金屬旋鈕）- C尺寸短款

The metal knob is a nice upgrade over plastic—it grips firmly without any flex when I tighten it. Both 1.5" ball sockets seat snugly, and the arm holds its position perfectly on rough terrain. Solid build for the price.

The single spring mechanism makes swapping between different ball bases effortless while keeping everything locked tight. I’ve been using it for mounting accessories and the short arm length provides just the right amount of reach without excessive wobble.

The metal knob gives a much more secure grip than the plastic ones I've used before. Tightens down firmly on both ball mounts with no slipping, even under heavy load. Exactly what I needed for my setup.