8 Series Single block works with 78-77 base only. Stainless Steel cheeks, Delrin(tm) sheave runs on Nomex(tm)/Teflon(tm) bearing for low-friction yet high strength operation. Spring mounted, on 1 in -12 threaded stainless steel plug. Height = 4-5/8 in (119 mm) SWL: 2750 lb Works with 78-77 Base.
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