The Harken Micro Block Pulley H224 has high load capabilities, but remains light weight. Accepts up to 1/4in line, 1200 pound load, 7/8in diameter sheave. Fast trim and release under high or low loads. Ideal for sailboards, smaller dinghies, and for lightly loaded control lines on boats of all sizes. Free-rolling Delrin ball bearings, sheave and sideplates UV-stabilized, with carbon-black additive for maximum protection. Stainless steel sideplates for strength.