SCHAEFER 51mm 5 Series Block - Swivel, 504-05 Block Configuration_Exit Block (4) #10 RH fasteners

(4) #10 RH fasteners

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

Harken 51mm Thru-Deck High-Strength Block allows lines through the deck and bulkhead

Provide chafe protection where lines pass through decks

The versatile universal head design has a three-way built-in locking feature and accepts Schaefer "universal" adapters for custom mounting

SCHAEFER 51mm 5 Series Block - Swivel, 504-05 Block Configuration_Exit Block (4) #10 RH fastenersSchaefer 5 Series single Aluminum Block with Delrin sheave ensures smooth operation with the high safe working load. Used extensively for sheet blocks on small to mid sized keelboats, and as control line blocks for larger offshore boats. Suitable as mast base or lead blocks on small to mid sized boats. Adaptable universal three way head. Black anodized aluminum or stainless steel cheeks. Stainless steel straps and posts.