Manfrotto Carrello doppio con 2 frizioni - This is equipped with brakes on both upper and lower carriages. The upper brake blocks the carriage on the fixed rail, while the lower carriage's brake blocks the sliding of the moving rail.
Manfrotto Carrello doppio con 2 frizioni - This is equipped with brakes on both upper and lower carriages. The upper brake blocks the carriage on the fixed rail, while the lower carriage's brake blocks the sliding of the moving rail.