Double block with ball bearing sheaves and becket. Works with 706-25 for a 4:1 purchase. Removable becket allows pre-spliced lines to be easily attached. Swivel head design may be locked in place to eliminate twists. Delrin(tm) ball bearing sheaves provide low-friction yet high safe working load. Sheave Dia. 2 3/8" (60mm), Thickness 2" (51mm), Width 2 1/2" (64mm), Length 7 3/32" (180mm), SWL 1700 lbs. (771kg), Weight 14.3oz (405g), Max Line 1/2" (13mm)