5 Series fixed lead halyard/control block. Delrin(tm) ball bearing sheaves ensure low-friction and high strength. Low profile lead keeps control lines and halyards close to the deck. Stainless Steel base provides a strong plateform. Sheave Dia. 2" (51 mm), Max Line 7/16" (11 mm), Length 7/16" (11 mm), Width 13/16" (21 mm), Heigth 2-17/32" (64 mm), Bearing Height 23/32" (18 mm), Fasteners (2), 1/4" RH (6 mm), C/C 2-1/4" (57 mm), SWL 1000 lbs. (454 kg), Weight 4.3 oz. (122 g)