Stand up spring block for 1-1/4" T-Track. Delrin(tm) sheave ensures smooth operation and high safe working load. Anodized aluminum cheeks and stainless steel slider ensure reliability. Polyethylene liner and pin stop allow for easy adjustment. Track Size 1-1/4" x 3/16" (32 mm x 5 mm), Boat Size Up To LOA, 33', 12000 lbs., 520 sq. ft. (10 m, 5455 kg, 48 m2), Sheave Dia. 2-3/8" (60 mm), Max Line 1/2" (12 mm), Length 4" (102 mm), W 1-9/16" (39 mm), H 4-15/16" (126 mm), Bearing Height 2-3/8" (67 mm), SWL 2250 lbs. (1020 kg), Weight 12 oz. (340 g)