HARKEN SINGLE MICRO BLOCKHARKEN #224Micro blocks are small lightweight, free running blocks. They are ideal for use on sailboards, smaller dinghys, and for lightly loaded control lines on boats of all sizes. USE FOR: cunninghams/outhauls-vangs-traveller controls-barberhaulers-flag halyards-leech cords-lead car return tackles. Sheave: 7/8-inchdia max. line:1/4-inch max. working load 200lb. breaking strength 1200lb.