Durable: Die cast aluminum construction manufactured to be durable and last long. Available in multiple finish and length options from 18-48 inches. H Track extensions are extension rods used to drop a line voltage fixture to a specified distance below the track surface. H track extensions may only work with H track systems. These are available in a variety of lengths and cannot be field cut. WAC H-L-J-J2 track systems can be used with WAC and a variety of other manufacturer's track systems. Please order your track, components and fixtures according to your system's compatibility. WAC track is fully dimmable. Single Circuit 120V track, power per Circuit: 120V, 1920W max per circuit, Operating Current: Rated 20A max. Compatible with H track systems by WAC Lighting. Also compatible with H systems from other leading lighting manufacturers. Standards: UL & cUL Listed for Dry Locations. Track lighting systems are open conductors and intended for indoor use only.