For Custom Blinds ONLY Clutch Plug Rib fits into the 40 mm diameter head rail of Coolaroo Outdoor Roller Shades (non-custom roller shades) Suitable for both Coolaroo Corded and Cordless style Outdoor Roller Shades. Each shade uses one (1) Idle End Plug Rib and one (1) Clutch End Plug Rib, sold separately. Sold individually.