The Universal Umbrella Adapter, also known as Solstice by Maxey, comes in one size. It simply slides inside the bottom half  of a two ( 2 ) piece  Beach Umbrella. The Umbrellas and hitches are sold separately. All Adapters come fully assembled and ready to be bolted to your desired apparatus. The  Universal Umbrella Adapter is sold under PPA application # 2021903472 with,  Australian Government / IP Australia. All rights reserved to Maxey's Enterprise llc.Secretary State of Mississippi USA.