RWO R1814 PVC spring - Gray Elastomer Boot for 57mm Block (PK size: 1) R1814 - Gray Elastomer Boot for 57mm Block (PK size: 1) Elastomer Spring for Blocks Up to 57mm Dia Height of Spring 51mm, The Ideal Solution to Standing A Block Head Up High Whilst Keeps The Chance of Rope Snag To The Minimium SKU: R1814 Product Information Boat Type Catamaran, foiling dinghy, monohull dinghy, single handed dinghy, sports boat Dimensions H 51mm, dia. 45mm Quantity in Pack 1 Weight 9g Suitable for: Spirou