Complete 2D counterweight system. Allows balancing of heavy equipment attached to either end of your telescope AND above or below the tube assembly. Suitable for 7 inches Maksutov, Meade 10 inches, new Celestron 9.25 inches and Celestron 11 inches (C11 requires part VCB11). Dovetail mounted, dual axis movement, 1.1kg weight included. No tool operation. Weight 1.9kg total. Length 438mm. Mounts to existing holes - hardware included. Losmandy Part VWS17