blocks and sheaves for sale, brand-new and used.

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HARKEN 100 mm Single Swivel Block with Becket Black Magic AirBlock Condition: New

The ISC medium arborist block is a great tree rigging block for professional use. This block is built for serious use with practical features that set it above other tree rigging blocks. The upper sheave is over-sized so that it can accept up to 1” tree rigging slings.

Product Description 100 mm Black Magic® AirBlocks® are used on offshore boats where weight and performance are critical. They feature free-rolling, largediameter aluminum sheaves with Torlon® roller bearings housed in a unique center cage. UV-resistant, carbon-black Delrin® balls carry sideloads.