Complete 2D counterweight system. Fits Celestron 8 or Meade 8 Schmidt Cassegrain tube assemblies. Dovetail mounted, dual axis movement, 1.1kg weight. No tool operation. (C8 requires part VCB8 if hole separation is 1.75 inches apart) Weight 1.8kg total. Length 343mm. Mounts to existing holes - hardware supplied.