02-50 Halyard/Control Block. Delrin(tm) sheave ensures smooth operation and high strength. Stainless steel cheeks and base provide a solid platform. Sheave Dia. 1-1/16", (27 mm), Max Line 5/16", (8 mm), Jaw Opening 1-9/32", (35 mm), Pin. Dia. 1-13/32", (35 mm), Length 1-11/16", (43 mm), Width 21/32", (17 mm), Uses (4) #10 RH (5 mm), C/C Length 1", (25 mm), C/C Across 1", (25 mm), SWL 900 lbs. (410 kg)