Spring Loaded/Lined Slide/Aluminum for 1" T-TrackDelrin™ 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. Specifications:Track Size 1" x 1/8" (25 mm x 3 mm)Max. Boat Length- 27' (8m)Max. Boat Weight- 5000 lbs. (2270 kgs)Sail Area- 315 sq. ft (29 m2)Sheave Diameter 2" (51 mm)Max Line 7/16" (11 mm)Length 3" (76 mm)Width 1-1/4" (31 mm)Height 4-5/32" (105 mm)Bearing Height 2-7/32" (56 mm)SWL 1750 lbs. (795 kg)Weight 7.0 oz. (198 g)