Harken 29mm Carbo Cheek Blocks are great for control lines: vangs, outhauls, cunninghams, spinnaker controls, traveler controls, and more.  This block is lightweight and compact, with quick trim and release under all loads.  Accepts line up to 5/16" in diameter.  Used on PocketShip and on upgrades for other CLC sailboats;  these are indispensable for running control lines aft to the skipper.

• Length: 2-1/8"
• Sheave Diameter: 1-1/8"
• Max Line Diameter: 5/16"
• SWL: 330 lb
• Breaking Strength: 1000 lb