The D Cable Block is used for supporting a single cable up to 2 3/4 in. in diameter on 1/4 – 3/8 in. bare strand prior to the lashing process. The frame and sheave are made from 100% heat treated aluminum alloy. The sheave contains oilite bearings for a smooth pulling operation and a long lasting life span. Contains steel inserts on the underside of each strand hook for smoother pulling and less wear. Lever actuated bi-directional cam locks the frame on the strand to prevent travel while pulling in cable.