Single Aluminum Block with Alum. Sheave 704-06Single block with anodized aluminum cheeks and aluminum sheave. Aluminum sheave runs on nomex(tm) Teflon(tm) bearing for low friction and high strength. Swivel head may be locked in place to eliminate twist. Sheave Dia. 2 3 8" (60mm), Thickness 1 3 32" (28mm), Width 2 1 2" (64mm), Length 5 1 32" (128mm), SWL 2250 lbs. (1020kg), Weight 10. 2oz (289g), Max Line 1 2" (13mm)