Series Blocks

1 Series Blocks are Schaefer's smallest. They're suitable for dinghies, prams and small day sailers. 2 Series Blocks are perfect for vangs, outhauls, backstays, cunninghams and other control blocks on boats up to 25 feet. 3 Series Blocks are excellent for mainsheet systems, halyard leads, and genoa leads on small cruisers, day sailers and high-performance racing dinghies up to 25 feet. (Control lines up to 30 ft.) 

Schaefer 5 Series Blocks offer small to medium-sized cruising and racing yachts an extremely high strength/weight ratio, resulting in a highly reliable block. They're a great choice for mainsheet systems, halyard leads, and genoa leads on boats up to 28 feet. (Control lines up to 36 ft.) 7 Series Blocks are designed for medium-sized cruising and racing yachts up to 34 feet. (Control lines to 45 ft.) Schaefer's 8 Series and 10 Series Blocks are suitable for larger boats up to 42 feet and 46 feet, with control line applications to 52 feet and 60 feet, respectively.