32-33-UC half-moon lead block. Stainless steel cage and slider ensure high safe working load. Aluminum sheave runs on Nomex(tm) bearing with Torlon(tm) ball bearings for a low-friction sheave and high safe working load. Center pin adjustment prevents snagging and accidental release. SS Springs keep block upright while allowing up to a 45 degree articulation to both sides. Track Size 1-1/4" x 3/16" (32 mm x 5 mm), Up to boat size 44', Displacement 18000 lbs., Sail Area 715 sq. ft. (11.5 m, 8182 kg, 66 m2), Sheave Dia. 3-1/4" (83 mm), Max Line 3/4" (19 mm), L 5-1/2" (140 mm), W 1-5/8" (41 mm), H 5-7/32" (140 mm), Bearing Height 2-3/32" (54 mm), SWL 5000 lbs. (2270 kg), Weight 2 lbs. 2 oz. (964 g)