Ronstan 30mm Ball Bearing Single Block with becket can be used for: Primary lead blocks on dinghies and catamarans Control lines on larger yachts It features: Low friction 2-stage ball bearing system provides consistent performance over the full working load range. High static and dynamic load capacity. Light weight Versatile head fittings Low friction, 2-stage ball bearing system High static and dynamic load capacity Lightweight Cheek cut-outs for easy bearing maintenance If this product is out of stock please contact [email protected] and we can advise on availability.  Sheave Ø 1 3/16 in. Max. Rope Ø 5/16 in. Max. Cable Ø - in Pin Ø 5/32 in. M.W.L. 660 lb. B. L. 1650 lb. Weight 1.4 oz.