This thing gives your bathroom tissue roll a smooth run.
This is to be used with roll sticks whose diameter are smaller than the roll hole. These cap ends make the axe fit inside them so when you pull the paper out the hole roll is stable and runs smooth.
The caps included have both different internal diameters. As you can see in the pictures the stick I made this for has different diameters on both ends. Internal diameter for the larger is 24.20 mm and 21 mm for the smaller one.
The caps are strong but thin it is easy to sand them to measure so it fit other larger sticks if needed.
Whenever possible install them on new unused rolls. Already used roll holes are usually out of shape and then its more difficult to keep the caps in.