Some showers can be opened and cleaned by twisting the front plate open.

Most showers however don't have any good spot to grip or are with their age very difficult to open.

This tool fits into the shower's jet openings and allows you to firmly grab and turn the front plate with hands or even better a large wrench.

Be aware this will not fit every shower and i have no idea what model i have (its rather old) Check if the holes and peaks are the same count, maybe it fits!

Be aware that your shower may not open this way at all, even if its a fit.