Fiddle block with anodized aluminum cheeks and ball bearing sheaves. Works with 706-75 for a 4:1 purchase. Delrin(tm) ball bearing sheaves feature a single top sheave and two in-line sheaves to spread the load reducing friction and chafe. Swivel head design may be locked in place to avoid twist. Upper Sheave Dia. 2 3/8" (60mm), Lower sheaves diameter 1-13/16" (46mm) Thickness 2-11/16" (68mm), Width 3 31/32" (101mm), Length 7 15/32" (190mm), SWL 1700 lbs. (771kg), Weight 1lb 5 oz, (595g) Max Line 1/2" (13mm)