Stainless steel double swing side snatch block - For extra heavy loads, you can multiply the winches’ power using pulleys. This double pulley features the same aluminum and stainless steel construction as our stainless steel swing side snatch block PCA-1274 but with two 4'' diameter deep groove aluminum sheaves. Using one double pulley (positioned at the load) with a single pulley, you can triple the pulling power of the winches. With two double pulleys, an amazing 4 tons of force can be exerted on a load using the PCW5000!