Spinnaker Pole Slider - Towable/ Lined for 1" T-Track 17-78Stainless Steel Spinnaker Pole slider allows for easy adjustment with the addition of a variety of cheek blocks on the front of the mast.Slide is lined for easy adjustment.Track Size 1" x 1 8" (25 mm x 3 mm), Ring I. D. 1 1 2" (39 mm), Ring Stock 5 16" (8 mm), L 5 5 16" (135 mm), W 2 29 32" (74 mm), H 3 1 4" (83 mm), Weight 14 oz. (397 g)