This is a great block for the cunningham or outhaul on the LaserŽ Sailboat. It replaces the single becket block with a lighter smooth running block. Lightweight Highest working load in its class Secure, versatile and secure attachement Low profile and compact RF35101 accepts RF1850S shackle in both orientations to create a conventional loop top block. Self-lubricating NylatronŽ sheave and full contact bearing for high dynamic loads Ultra low profile thru-sheave becket Sheave - 1 3/16 in. Max. Rope size- 5/16 in. /8mm M.W.L. 661 lb. B. L. 1323 lb. Weight 0.8 oz. Availability: Usually ships the next business day. RF35101Regular price: $19.99Sale price: $17.99 Due to the wide variety of the size and weight of our items we will charge the actual cost of shipping in a separate charge on all orders. Please email us for a shipping cost estimate. Shipments outside the USA may have add on fees and duties by your own government. Sailing can be green! See our recycle your old sail offer Send us email