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The 3 ton 4 inch ball bearing block is simply the best block available for any overhead lift application requiring blocks. Hot-dipped galvanized, grease-able, ball bearings, breakaway shackle and a raised stamp rating meet all requirements for the perfect installation. The ball bearings eliminate friction and can be maintained using the easy to reach Grease fitting. The breakaway shackle allows easy replacement or installation without having to uninstall the cable. The hot-dipped galvanized coating far exceeds the standard zinc plating found on most blocks and the raised stamp rating meets industry rating requirements. The ball bearing blocks only weighs 5 lbs