If you have a Native Manta Ray Propel kayak and it doesn't have Groove Tracks fitted, adding some is easy. The screw straight into the holes on your kayak.
If you have a different brand of kayak these could potentially be fitted. If you have a level section on the deck of your kayak, you could attach these using nuts & bolts, or rivets.
Contents: A pair of Groove Tracks and fitting screws