Attractive and unusual fitting - also available as 8 way.  Recommend using 5/6 watt dimmable LEDs (40 watt equivalent) and a (special purpose) LED dimmer switch (or it will be very bright).  When it arrived, the arms are bunched together and loose but can easily be positioned and the securing nuts tightened with the supplied spanner.  In my case however, one of the nuts was cross-threaded and could not be tightened resulting in a very floppy arm!  I could have returned it but instead I cut the wires on the offending arm, re-cut the damaged thread and then re-spliced the wires (I am an Electronic Engineer - I do not recommend this procedure unless you know exactly what you are doing).  The manufacturer needs to review quality control procedures.