Optics Ø12 mm clear glass Beam angle 54° Material Aluminium Colour Grey Surface treatment Anodised Size Ø21 x 2.5 mm Weight 13 g Mounting Recessed with spring Mounting hole Ø18 mm Built-in height 23.5 mm Min. tail size Ø1 mm Max. tail size Ø6 mm Protection rating IP 44