A convertible tube adapter including a top connection point, a shaft, a bottom connection point and a knob. The top connection point includes a plurality of connection contacts integrated on a first side of the top connection point, a fastener receiving surface integrated on a second side of the top connection point and an aperture incorporated between the plurality of connection contacts and the fastener receiving surface. The shaft is configured for insertion into a tube which is fixedly integrated into an object. The shaft includes a pair of bumpers located on each side, which each extends outward from a side surface of the shaft. The bottom connection point is attached to a bottom end of the shaft and includes a carve-out structure integrated into its rear surface which is configured to receive a mating pin positioned at the bottom of the tube to prevent the adapter from rotating in the tube. The adapter is configured to effectively convert the tube into a mount when the shaft is inserted into the tube by allowing an article to attach to the top connection point of the adapter.