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Simple yet strong double roller race block which is low weight and operates well under a wide range of load conditions. Carbon fibre needle roller bearings mean it runs smootly under high loading conditions and freewheels under light loading for fast take up. The swivel adaptor operates through 360 degrees making it ideal for even the most complicated suspension system. With two acetal sheaves which operate two ropes simultaneously.Takes all types of rope up to 10mm (8mm max recommended).