Ball bearing air blocks:
• Sheave : 2-1/2"
• Maximum line diameter: 1/2"
• Safe working load: 2800 pounds

To prevent the line from twisting or binding when used in a cascade or mainsheet system this block is supplied with a feature to lock the rotation of the shackle that is on top of the body of the block. With the use of an Allen wrench, tighten the set screw to lock the shackle in position. When used as a swiveling block, ensure the set screw is not tightened and the swiveling shackle can self-align to find the fairest lead.

• (2) single blocks for the boom
• (1) single block w/ becket for the boom
• (1) fiddle block with additional single block attached to and replacing the becket for the traveler
• (1) single block at the base of the mast

This item does not conform to the shipping table in the Shopping Cart. Additional shipping must be calculated. When you place your order we always call with a shipping quote before billing your card. For a quote in advance, just call 800/959-7245.