Fiddle block with anodized aluminum cheeks, becket, cam cleat and snap shackle attachment. Snap shackle allows for a variety of attachments and may be locked to avoid swiveling with a simple set screw. Delrin(tm) sheaves ensure smooth operation and high safe working load. Works with 704-49 or 704-45 for a 4:1 purchase. Sheave Dia. 2 3/8" (60mm), Thickness 2 11/16" (68mm), Width 4" (102mm), Length 9 9/16" (243mm), SWL 2250 lbs. (1020kg), Weight 1lb. 6oz. (624g), Max Line 1/2" (13mm)