Harken HK2644 Cheek 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 220 kg
Breaking load 735 kg

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