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 open ended wrench, tighten the nut on top of the block body to lock the shackle in position. When used as a swiveling block, ensure the nut is not tightened and the swiveling shackle can self-align to find the fairest lead.

Approximate Dimensions:
• Sheave Diameter: 2-1/2"
• Maximum Line Size: 1/2"
• Maximum Safe Working Load: 2,800#
• Inside space between shackle and pin: ~1-1/16"
• Inside width of shackle: ~7/8 down to ~3/4" as starts bend
• Shackle pin diameter: 3/8" with hole for wiring in place
• Jam nut to prevent rotating: Use 3/4" wrench to tighten / adjust
• Overall height including shackle: ~7"
• Overall thickness at sheaves: ~2-1/8"
• Torlon ball bearings C-445