Sunshade Stand Adapter

This is an adapter for a sunshade or umbrella stand. Its outer diameter is 27mm and the inner is 19.5mm. There is a little cutout for a metal piece. This where the tightening screw can grab without damaging the plastic adapter. To add the metal piece you only need a M3 threaded insert and screw. On the other side is a small hole to insert a screwdriver through.