Superior Marine Products Lobster Hauling Block. Size 4, high lip. Sheave diameter is 4". Weight is 7.56 pounds. Throat dimensions: width is 2-5/8", height from sheave is 4-1/2" and height from lip is 3-3/4". Overall block height is 14-1/4". Zinc plated with safety latch and greasable swivel. Forged steel hook. Aluminum sheaves. Heat treated aluminum castings. Stainless steel fasteners. Bearing: tapered roller. Shields: cast-in labyrinth. Seals: Neoprene lip on stainless steel. Capacity: 2000 pounds.