Harken Stand-up Base for Midrange and ESP Blocks

Midrange, Cruising ESP Base

Stand-up bases allow a wide variety of blocks to beheld upright, swivel freely, or pivot so lines have a fairlead under load. Use the 1634 stand-up base with Midrange blocksand 57 mm or 75 mm Cruising ESP blocks. Block headpost fits into socket without shackle.