Ronstan Series 55 Ratchet Orbit Block ™ features: Up to 20:1 holding power Smooth easing of sheets High performance cleating Easily fitted and securely retained Dyneema® Link head Automatic & manual ratchet block Sheave Ø 55 mm Max. Rope Ø 10 mm Max. Cable Ø - mm Pin Ø - mm M.W.L. 250 kg B. L. 750 kg Weight 78 g