Well conceived but poorly executed
I bought 4 Banggood holdowns for 20mm holes in my workbench. Three were just acceptable, although a bit tight for easy use, but the 4th was so tight it was unusable. I contacted Banggood several times requesting a replacement but have had no response. In the end I have solved the problem by rubbing down the posts with coarse alox paper until all were an easy fit. I had already reamed the holes in my worktops with the excellent Axminster 20mm reamer to ensure they were accurately 20mm. Conclusion the Banggood product was well conceived but poorly executed and Banggood customer service and support leaves a lot to be desired. They have a good range of products and others I have bought from Banggood have be good value but it is a shame that customer support is not better.