The manfrotto sympla 20 rods are 150mm in length 15mm in diameter and feature an improved scratch resistance design and are fitted with 13unc screw junctions these short rods are one of the basic building blocks of all sympla rigs and are always used in parallel pairs to create a track which allows components to be mounted and positioned correctly rods can be joined together to make longer tracks using the included screw junctions joined at different heights using the v offset compone