SMC Swiftwater Pulley 3 Sigma MBS: 7,644 lbf (34kN) Max Rope size: 1/2'' (13mm) Certified to meet UIAA127/EN12278 Anodized side plates feature a series of holes that help minimize the hydroplaning effect that might otherwise occur with other pulleys Uses sealed ball bearings which provide optimal efficiency, thus reducing the performance-robbing resistance that is inherent in most multiple component systems Sheave: 2'' Aluminum