Barton N02740 - BACKSTAY TENSIONER SYSTEM - Block and tackle system designed for use on twin or split backstays. Features stainless steel double block with brass sheaves, together with tensioning blocks from Barton's series 2 range. Sheave Dia: 45mm Sheave width: 8mm Rope Dia: 5mm Wire Dia: 5mm Break Load: 1300kg SWL: 650kg Weight: 163g