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 low profile auto ratchet block also features an under-hung becket, adjustable carbon fiber C-Cleat and a swivel shackle head. A 'piggyback' block can be attached to the under-hung becket for 7:1 (or greater) purchase. For mainsheet systems on catamarans up to 18' (5.5m) and small keel boats up to 30' (9mm).Note - Pair this low profile auto ratchet block with the ORBIT 55 Triple Block with Swivel & Becket (part # 256240) for an excellent 6:1 mainsheet system for beach cats such as the G-Cat 5.0m, Hobie Catฎ 16, Hobie Catฎ 17 and Prindle ฎ16.316 Stainless Steel & Glass Fiber Reinforced NylonMax Line Size: 3/8 (10mm)Shackle Pin Diameter: 3/16 (5mm)Sheave Diameter: 2-5/32 (55mm)Weight: 13.8 oz (392g)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) RF56330B - -
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