For use with shades weighing up to 8 Lbs. RollEase pioneered the roller shade clutch and has perfected the manufacturing process of operating systems since their introduction in the 1980's. RollEase has more than 25 patents for invention with a full time staff of design engineers working exclusively on improvements and extensions of existing systems as well as the development of new operating systems. All clutch components other than the springs inside are made of a glass reinforced thermopolymer to ensure years of trouble free performance and prevent oxidation of external materials. This clutch should be used with bracket models RB360 or RB380.