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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.