Acratech Ultimate Ballhead with QR Locking Lever Clamp, 25 lbs Load Capacity Acratech Ultimate Ballhead - 1/4"-20 Reducer Bushing - Bulls Eye Level - Quick Release Locking Lever Clamp - Level - Rubber Knobs - Detent Pin - Acratech 10 Year Warranty - Note: Requires Quick Release Plate Arca-type quick release system Absolutely no migration after tightening the clamp Silky-smooth black anodized finish for precise positioning Open design facilitates quick maintenance