The ORBIT Series 55 block features hard anodized aluminum sheaves, high compression strength carbon black Acetal ball bearings, and glass fiber reinforced nylon frame/cheeks. A high performance and extremely low friction block at a great price point.This ultra low profile triple block also features an integrated becket and swivel shackle. For mainsheet systems on catamarans up to 18' (5.5m) and small keel boats up to 30' (9mm).Note - Pair this low profile triple block with the ORBIT 55 Triple Auto Ratchet Block (part # 256280) for an excellent 6:1 mainsheet system for beach cats such as the G-Cat 5.0m, Hobie Cat® 16, Hobie Cat® 17 and Prindle ®16.316 Stainless Steel & Glass Fiber Reinforced NylonMax Line Size: 3/8 (10mm)Shackle Pin Diameter: 3/16 (5mm)Sheave Diameter: 2-5/32 (55mm)Weight: 8.6 oz (244g)Max Working Load: 1650 lb (750kg)*Breaking Load: 3300 lb (1500kg) * Total block load. Load on becket not to exceed 33% of block load: MWL 550l b (250kg), BL 1100 lb (500kg) RF55310 - -
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