The C Series is the original Roto Hammer line of chain wheels, patented over 50 years ago. While similar to our newer CL line in most ways, C Series wheels are substantially more robust and are ideal for the heaviest industrial applications and environments. For valves that withstand heavy use or that are located in highly corrosive environments, the C Series is ideal. Ductile Iron Clamp-on Chain Sprocket fits hand wheel sizes from 6 to 40 inches in diameterClamps on to existing hand wheel for safe, effective manual valve operationAll units come complete with sprocket wheel, chain guide, set collar, zinc plated hardware and installation instructionsC30 and C40 sizes are also available in galvanizedWhen ordering, provide diameter of existing hand wheel and length of chain required.