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Karver Composite K-Block 8mm (5/16) Dia. 50mm Spar Parts Optimist Ronstan Series 75 Single RatchetProduct Description Karver Composite K Block 8mm (5 16) Dia. 50mm The standard Karver blocks are assembled with rollers and balls bearing ensuring a very low friction. These blocks are ideal for applications, where a line under high load must run for a long distance. Model: KB8 Working load: 600 Kg (970 lbs.) Weight: 50 g (1. 42 oz.) Line diameter: 10 mm (5 16") Sheave diameter: 28mm Block diameter: 60 mm (1 31 32")