HARKEN 51 mm Wire High Strength Thru-Deck Block, 310 Product Type_Shackles Large sheave diameters and high

Large sheave diameters and high working loads make them suitable for sheet and control blocks on medium to large offshore boats

The sideplates are UV-stabilized

Shackles are forged grade 316 stainless steel

An integrated becket at the forward end of the car suits 2:1 sheet systems and the removable threaded pin allows easy fitting of alternate blocks and accessories

Commonly 57mm fiddle blocks are for jibsheets and vangs on small dinghies

HARKEN 51 mm Wire High Strength Thru-Deck Block, 310 Product Type_Shackles Large sheave diameters and highHarken 51mm Thru Deck High Strength Block allows lines through the deck and bulkhead. Harken's Lightweight, low friction blocks with high load composite bearings carry wire halyards and control line cascades. Side load balls reduce friction from twists or unfair leads on 304 311. 300 303 has thrust washers. Blocks open to allow passage of swaged wire. Hard Lube anodized sheave for strength and corrosion resistance. Cheek blocks include fasteners.