Triple block with anodized aluminum cheeks and Delrin(tm) ball bearings. Works with 706-98 for a low-friction 6:1 purchase. Delrin(tm) ball bearings ensure low-friction operation and high safe working loads. Swivel head may be locked in place to eliminate line twist. Sheave Dia. 2 3/8" (60mm), Thickness 2 29/32" (74mm), Width 2 1/2" (64mm), Length 5 1/32" (128mm), SWL 1700 lbs. (771kg), Weight 14.3oz (405g), Max Line 1/2" (13mm)