Photo Clam PG-2QR Premium Pro Head with Screw-Knob Style Clamp and Bubble Level - Black Supports up to 77 Pounds, Separate Pan Base and Ball Locking Knobs Bi-Axial Progressive Friction Control Arca-Style Quick Release, Weighs Less than 1 lb Fits Standard 3/8" - 16 UNC Tripods 360 Degree Pan & 90 Degree Tilt