Single Block with Front-Side Shackle and Becket. Works with 02-05 for a quick 3:1 purchase. Delrin(tm) sheave on plain bearing provides smooth operation and high safe working loads. Length 4-5/32" (106mm), Width 1-3/16" (30mm), Thickness 1-1/8" (28mm), Weight 3 oz. (85g), SWL 900 lbs (410kg)