Harken is a leading manufacturer of quality sailboat hardware and accessories. From world renowned events like the America's Cup and Olympics. Harken Our blocks and hardware can be found aboard everything from the smallest dinghies to the largest megayachts and cruisers. From the classic 18mm Air Blocks and 22mm Micro Blocks to the modern T18 and T2 blocks, we highly recommend considering Harken products when outfitting your small sailboat. Shop our extensive range of micro blocks, mainsheet ratchet blocks, airblocks, cleats, and more.