Ronstan Series 15 BB Block, Single Cheek, Single fastener mount Lewmar Standard Portlight Clip Screens the knees and seat are

the knees and seat are reinforced ensuring long-lasting wear

Mainsheet and self-tacking jib travelers on dinghies and catamarans

4 X M8 (5/16”) Holes

Longer Sling (2″ longer than standard)

Spinlock Headsail Luff Feeder

Ronstan Series 15 BB Block, Single Cheek, Single fastener mount Lewmar Standard Portlight Clip Screens the knees and seat areProduct Description Ronstan Series 15 BB Block, Single Cheek, Single fastener mount Features Smallest and lightest ball bearing block available Precision moulded acetal sheave running on stainless steel ball bearings provide high performance & low friction Single loop head blocks include an O ring to separate running line from head lashing or fixing Specifications Sheave 5 8 in. Max. Rope 3 16 in. M. W. L. 260 lb. B. L. 794 lb. Weight 0. 3 oz.