Description: Heavy-duty screw lock rigging block. Cool, unique design - flame pattern helps to reduce overall weight of block. Sideplates are made from durable stainless steel. ISC Rigging Blocks have colour-coded Side plates and Pulley Wheels, helping the user to easily identify the correct Block for the task. We have introduced a new fixed bollard dimension, which allows the user to fall in-line with rigging standard practice, whereby the Anchor/Topping Strop should be twice the Strength of the Working Line.