Set of 2 lateral robust plastic floats with a metallic tube. They are called outriggers or stabilizers.
They are meant to give the kayak a wider and more stable profile. The main mount is a 3cm square tube and the float mounts are 2,5cm tube, both are aluminium for less weight and no corrosion. The float tubes have three holes offering various width settings and the square tube has two slots drilled thus allowing fixing preset brass fittings in to the hulls of the RTM Abaco and K-Largo. So the overall width goes from 54" to 72", more than enough to suit anyone.
You can use it for mounting an outboard.