32-77 Twin Sheet Lead block. Anodized aluminum body is machined from 6061-T6 aluminum and articulates to ensure a proper lead. Anodized aluminum sheave runs on nomex(tm)/Teflon(tm) bearing for a low-friction high strength sheave. Pin stop makes adjustment simple. Track Size 1" x 1/8" (25 mm x 3 mm), Boat Size Up To LOA 29', Disp. 5000 lbs., Sail Area 315 sq. ft (8m, 2270 kg, 29 m2), Sheave Dia. 1-1/2" (38 mm), Max Line (2) 1/2" (13 mm), L 3-1/2" (89 mm), W 1-11/32" (34 mm), H 3-9/32" (83 mm), Bearing Height 1-29/32" (49 mm), SWL 2500 lbs. (1135 kg), Weight 10 oz. (284 g)