10 Series Single Block with Stainless Steel cheeks. Delrin(tm) sheave runs on Nomex(tm)/Teflon(tm) bearings for low-friction and high safe working loads. Stainless Steel D shackle run on a swivel head that may be locked in plate to avoid line twist. Bolted construction allows for easy maintainence. Sheave Dia. 3 1/4" (83mm), Thickness 1 7/32" (31mm), Width 3 1/4" (83mm), Length 6 19/32" (167mm), SWL 3750 lbs (1750kg), Weight 1lb 11oz (765g), Max Line 5/8" (16mm)