Chrlorine tablet holder that attaches to the end of your pool pole so you can treat these pesky algae spots easily . Can be mounted like the picture in the gallery or the head can rotated 90 degrees right or left Bolts to suit are M8 hex head and use wing nuts for quick tightening. For strength think of how your layers will be arranged. I printed the pole attachment the it laying on its side and the tablet holder on it's short side If you have an acetone vapor bath then is deosn't really matter as the layers will fuse anyway