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Ronstan, Enkeltblok med bøjle serie 25 BL124859 The Danish company Blue WaveRonstan Single block with shackle, series 25, is a mini block designed for lightweight applications. It is ideal for efficiently controlling ropes and lines on board the boat. Brand: Ronstan Weight: 0. 1 kg Working load: 300 kg Breaking strength: 800 kg Max line: 6 mm Series: 25 Sheave diameter: 25 mm Package dimensions: Size: 1. 5 cm 5 cm 9 cm Gross weight: 0. 1 kg Ronstan mini block single with shackle