Make your own clew block with this pre-spliced toggle and strop. If you want to use this with a Harken 18mm or 29mm Carbo Block we recommend selecting it with the soft eye (just above the toggle). When assembling the strop and block, the soft eye enables the strop to be threaded back through itself at the head of the block, ensuring that there is no stress at the head of the block. Supplied with fitting instructions. Note that the block is NOT included.