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. Halyard/Control Blocks are excellent for fixed position halyard, sheet or control line fairleads. Block swivels 360 degrees, tilts in all directions and is supported by a heavy gauge stainless steel sprint to prevent deck contact. Large diameter base helps distribute loads to a larger surface area than other smaller designs. Stand-Up Swivel - Aluminum Block Specifications: Sheave Dia. 2-2/8" (60 mm) Max Line 1/2" (13 mm) Diameter includes urethane base 3-3/8" (86 mm) Height 4-25/32" (120 mm) H2 2-15/32" (63 mm) Fastener Size (4),1/4" RH (6 mm) C/C 1-11/16" (43 mm) SWL 2250 lbs (1020 kg) Weight Alum. 11.7 oz. (332 g)
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