Product Description The TH2040 is a heavy duty impact block style lowering pulley, available in a choice of anodised colour finishes With swivelling side platesTH2040 can be easily installed mid line, and a simple ½ turn on the thumb screw secures the plates closed. The plates are forged aluminium for strength and impact absorption, and finished round and smooth to avoid rope damage. The block features a handy hollow bore on the large lower sheave which can be utilised for a secondary positioning line to rig the pulley away from the trunk, or for a speed line system With heavy duty stainless steel bearings, the large sheave can take rope up to 19mm diameter and has a working load limit of 20kN. In dismantling of large stems, the impact pulley is typically installed with a round sling or whoopee sling, just below the section being cut. Please remember, rigging of loads for dismantling trees is a dangerous operation where many unseen factors affect the behaviour of falling loads. Rigging should only be undertaken by trained personnel.