This is a foot that you can screw into the floor that fits my simply human trash can so that it doesn't slide around. The hole is for a #8 countersunk screw. You will need to remove the rubber one that the trash can comes with. Might be a good idea to install these first and then drill the hole into the floor through the inside of the trash can to make sure they are perfectly positioned. The OD is modeled at 28.5mm with 3 splines sticking out .5mm to make a snug fit.