If you want to have both a shower head and a hand held shower, these shower divertors are a great way to have both. 
The swivel side threads right onto your existing shower arm and then you have the other two outlets. One outlet is for your shower head, with the other being attached to a shower hose and then your hand held shower sprayer.
This is a great way to put together what you need to make your shower the most convenient for yourself and adapt it to your specific needs.
Material: ABS Plastic.

Shower Arm Diverter