DWhen it comes to lifting and lowering loads, chain blocks (also commonly referred to as chain pulley blocks, a block and tackle, or chain hoists) are a fantastic tool for giving yourself the means to handle and manoeuvre loads efficiently and safely.A chain block uses mechanical gearing to reduce the effort of the user to lift the load. A chain block comprises of a load chain fitted with a hook, safety catch and a hand or pulley chain that’s used to operate the hoisting mechanism.