3"spacer kit (with 9" bolts) for a 7 degree dry joint riser (MC-20-864309) sold in pairs.  Used with MerCruiser Dry Joint exhaust applications on 350 MAG, 357 MAG, 383 MAG STROKER, 4.3L, 5.0L, 5.7L, & 6.2L engines that use the 7° degree riser.  Mounted between exhaust manifold and exhaust riser.