Manfrotto 529 Hi Hat helps you take shots from the lowest points. Rubber-coated feet to protect floor coverings. They also have holes that allow you to attach the tripod to a sheet of plywood or an Apple box using screws. 
Characteristics:
Material: Aluminum
Load: up to 20 kg
Height min-max: 14.5-19.5 cm
Bowl diameter (ball) - 100 mm