This light comes with all the supplies needed to attach the light to both concrete and drywall. When placing this light into drywall you will need a 42mm hole cutout that is 20mm deep while for concrete this light requires a 45mm hole cut out that is 90mm in deep for the installation tube. The LED driver fits either into the void in the drywall or the tubing of the concrete.The light measures 48mm by 48mm and recesses into the wall for a semi-flushed look. With a brushed aluminum finish this recessed LED wall light beam of light projects downward washing your stairs in a gentle glow. Each light is supplied with an individual driver and is wired into your 240 volt mains supply.Ideal for use as level level lighting along an internal wall, alongside stairs or recessed into the stair riser to give a pleasant stylish glow.