As the foundation for custom-build speed rail rigs, this Tilta Speed Rail Set features six pieces of 50mm speed rail in two different sizes designed to support multiple configurations for various shock-absorbing arms. The six speed rail pieces, which are compatible with the Hydra Predator Shock Absorbing Arm, may be interconnected to form longer pieces or can be used on their own for different types of rigging needs. The set is also a replacement for the one included in the Speed Rail Car Mounting Kit from Tilta.