Adjustable E27 ceramic bulb holder. The dimensions of the ceramic holder are in the pictures. Both ball joints are reinforced with a bolt inside. The ball has 20mm of diameter. Supports are only required for the nut hexagon recess (as the showed). Requires: 1x M4x30mm + 1x M4 nut (self-locking recommended) + 1x M4 washer, for the arms and knob. 2x M3x30mm + 2x M3 washer (9mm O.D.) + 2x M3 nut, for both ball joints reinforcement bolt. 2x M3x12mm + 2x M3 Washer (7mm O.D.) + 2x M3 nut, for the E27 bulb holder.