Order before 7pm/8pm, shipped same day! Free shipping and returns. Bulb included: Nee Specifications: Extra functions:Dimmable, dimmer not included With X-coupling piece for the professional 3-phase rail, you provide your 3-phase rail with a coupling in the middle and complete your rail system. It is a component for a 3-phase rail, which means that each spot on the rail can be controlled individually. Are you looking for lighting where flexibility is a must? Then a 3-phase rail is the perfect solution. Often used in a professional environment such as the office or in the hospitality industry. 105 mm x 105 mm x 30 mm ( l x w x h )