Triple block with ball bearing sheaves. Works with 506-93 for a 6:1 purchase. Delrin(tm) ball bearing sheaves ensure low-friction operation. Sheave Dia. 2" (51mm), Thickness 2 3/8" (61mm), Width 2 1/8" (54mm), Length 4 13/32" (112mm), SWL 1500 lbs. (680kg), Weight 9.2oz (261g), Max Line 7/16" (11mm)