Harken Wire Block - 38mm Groco Inner pole is made of

Inner pole is made of drawn 6063 T8 heat treated

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Sailing Specialties Universal Mast Boot

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Harken Wire Block - 38mm Groco Inner pole is made ofLightweight, low friction wire blocks carry wire halyards and high strength control lines on boats of all sizes. Sheave (mm) 38 mm Sheave (in) 1 1 2 in Weight (g) 78 g Weight (oz) 2. 75 oz Shackle pin (mm) 6 mm Shackle pin (in) 1 4 in Maximum wire (in) 1 8 in Maximum wire (mm) 3 mm Maximum line (mm) 5 mm Maximum line (in) 3 16 in Maximum working load (kg) 680 kg Maximum working load (lb) 1500 lb Breaking load (kg) 1361 kg Breaking load (lb) 3000 lb