TH-55G Tripod Head 55mm Low Profile Ball Head Mount with Lever Clamp and QR Quick Release Plate for DSRL Camera,Load 77lb(35kg)Model: TH 55G Ball Diameter: 55mm 2. 2in Base Diameter: 72mm 2. 8in Height: 97mm 3. 8in Base Thread Socket: UNC 3 8 16 Net Weight: 739g 1. 6lb Load Capacity: 35KG 77. 2lb Material: Aluminum Base Socket Depth: 11mm 0. 4in Clamp Type: Lever release Clamp Low center of gravity provides better stability, Low center of gravity compared with traditional ballheads which lowers center of gravity of the whole setup in shooting and provides better stability.