Tornado Swivel Block 2:1 Pulley - Black/Silver/GreenThe Tornado Anchor Swivel Block is the perfect add on for your anchors! The Swivel Block offers two features: 1. the Block uses a 2: 1 mechanical advantage that effectively reduces the force need to haul in your anchor by half! & 2. the Swivel Block, well .. you guessed it! Swivels! This rotation eliminates any unwanted rope twist when deploying or retrieving your anchor. The design of the block is just 3 1 2" tall to keep your anchor tight to the