Superior Marine Products Lobster Hauling Block. Size 5, long back, low lip. Sheave diameter is 5". Weight is 10.6 pounds. Throat dimensions: width is 4-1/4", height from sheave is 4-3/4" and height from lip is 3-3/4". Overall block height is 15-1/4". 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.