Reefing slide for most boats to 40' (12.2m). Polyethelyne liner in slide allows easy adjustment. Track Size 1-1/4" x 3/16" (32 mm x 5 mm), Boat Size Up to 40' (12 m), Bail Width 13/16" (21 mm), Bail Height 17/32" (13 mm), L 4" (102 mm), W 2-11/32" (60 mm), H 1-3/32" (28 mm), Weight 5 oz. (142 g)