Fiddle block with anodized aluminum cheeks, ball bearing sheaves, becket and cam cleat. Works with 706-45 for a 4:1 purchase. Delrin(tm) ball bearing sheaves ensure smooth operation and high safe working load. Swivel head design may be locked in place to avoid twist. Sheave Dia. 2 3/8" (60mm), Sheave Dia. 2 3/8" (60mm), Thickness 2 11/16" (68mm), Width 4" (102mm), Length 8 25/32" (223mm), SWL 1700 lbs. (771kg), Weight 1lb. 5oz. (595g), Max Line 1/2" (13mm)