Rubber Well Nut - Pack of 10 with Countersunk Bolts
The well nuts offer an option for attachment of accessories to the kayak where access to the inside of the hull is not possible. Drill a 9.5mm hole to install. They have a M5 thread brass insert within rubber and once tightened will provide a water tight seal.
With Stainless Steel Countersunk Bolts
Price is per pack of 10 with Bolts