Acratech Quick Release Clamp with Metal Knob
Description (from B&H): The Acratech Arca-Type Quick Release Clamp with Metal Knob is a quick release head that accepts any of the Arca-type plates available from Acratech and from Arca-Swiss. It has a 25 lb weight capacity. It also has a 3/8″ screw mount but will adapt to 1/4″ if needed. Despite weighing just 3 oz this clamp is constructed with stainless steel and has a solid feel. The clamp comes in a satin black anodized finish and features a secured locking knob to prevent loss.