Barton Size 3 45mm Plain Bearing Pulley Block Double Swivel Becket [N03231] Exercise Bikes This Si02 formula is a

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Barton Size 3 45mm Plain Bearing Pulley Block Double Swivel Becket [N03231] Exercise Bikes This Si02 formula is aSize 3 45mm Plain Bearing Pulley Block Double Swivel & Becket The size 3 Barton plain bearing blocks have 45mm (1 3 4" sheave size 3 block range incorporates modern design with stainless steel frames and the latest advanced materials, using 30% fibre glass filled nylon and Acetal sheaves to maximise their strength whilst keeping weight to a minimum. Suitable for use as mainsheet, vangs, lead blocks, or wherever a powerful and compact purchase system