Twin Sheet Silver for 1" T-Track 32-8832 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