Harken HK2641 Triple Swivel Block

Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming.
Maximum line Ø 10 mm
Maximum working load 660 kg
Breaking load 1383 kg

http://www.harken.com.au/productcategory.aspx?taxid=4848