10 Series Block with Stainless Steel cheeks, becket and Aluminum "universal circuit" ball bearing sheaves. Aluminum sheave run on Delrin(tm) ball bearings for a very strong yet low-friction sheave. 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. Removable becket allows for the use of pre-spliced line. Sheave Dia. 3 1/4" (83mm), Thickness 1 7/32" (31mm), Width 3 1/4" (83mm), Length 8 19/32" (218mm), SWL 3750 lbs (1750kg), Weight 1lb 10oz (737g), Max Line 5/8" (16mm)