705-20 fits Isomat mast collar with a pin diameter of .510". Stainless steel cheeks and Delrin(tm) sheave ensure smooth operation and high safe working load. Sheave Dia. 2-3/8" (60 mm), Max Line 1/2" (13 mm), Pin dia. .510 Hole, Length 3-23/32" (94 mm), Width 2-1/2" (64 mm), Thickness 1" (25 mm), SWL 2250 (1020 kg), Weight 1 lb. 3 oz (539 g)