RONSTAN 50mm Utility Stand-Up Base, RF2450

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Ronstan stand-up springs and boots are specifically designed to support blocks in an upright position. Boots can be trimmed to the proper height, while springs allow the block to a rticulate under load to keep the sheave properly aligned. Series 50 blocks are typically used on boats up to 33' for main and spinnaker sheets, halyards, and other primary applications. Note: Special Order Only Show more