Description These Lynxmotion HUB-11 passive idler hubs are made to fit 2'' tracks Can be used with the lynxmotion 6 or 9 link sprockets (SPRK-01 and SPRK-02) Designed to fit perfectly between two panels separated by 1.5" standoffs (AHS-04) Weight: 12g (each) View more What's Included 2 passive idler hubs 4 ball bearings Mounting screws Dimensions Links Website