From leading boat hardware manufacturer Harken, combine the high strength and power. These strong boat blocks are suitable for large boats and some can be used on offshore and onshore boats.What type of Big Boat Blocks are you looking for? The MAURIPRO Sailing store provides a large selection of Big Boat Blocks. You can choose between Black Magic Blocks, Cruising ESP Blocks, Element Blocks, Air Runner Blocks and more.Do not hesitate to chat with us about your sailing and marine gear and equipment needs. We are here to help!