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Schaefer blocks have been manufactured in the United States since 1966 and are known for their legendary strength. Blocks are made from 316 stainless steel and hard coat anodized 6061-T6 aluminum alloy while the sheaves are made of UV protected Delrin. Schaefer offers the widest range of products for building block and tackle systems. Expertly tune your Mainsail with our 5 series Fiddle Blocks. Strong, smooth and reliable, they offer small to medium cruising and racing yachts an ideal solution for mainsheet and boom vang systems.