Non insulated single end gauge rod. Hold track to gauge by preventing rails from spreading or tilting. Single end gauge rods should be used for curved track. The jaws at one end attach to the base of the outer curved rail, which receives the greatest wheel side pressure. The hook at the other end grabs the base of the inner rail. Made for standard gauge 56-1/2-inch track and rail sizes 60-140 pounds/yard. Weight: 28 pounds. Product of Aldon ® Company.