Shower Arm for fixed shower heads. Material: metal. Connection thread 1/2". Can be used for all Grohe Rainshower head showers except Rainshower 400 mm. Note: the product may be supplied with the code 285760045 on the box, but it is the same product. Shower heads to be purchased separately. The Grohe Rain shower shower arm can play a pivotal role in your bathroom design. All you need to add is your choice of head shower and it is perfect for all Grohe Rain shower products except the 400 mm head shower. The dazzling scratch-resistant Grohe Starlight Chrome keeps its sparkle for a lifetime. The comprehensive and sophisticated Grohe Rain shower collection is the easy way to create a seamless bathroom design.