BG Nexus Plain Black Adaptable Metal 
Boxes 

100 x 100 x 37.5mm Weatherproof
Model: ADB2K/5-01

Steel boxes finished in black epoxy polyester (black)
Dimesions (L x W x D) - 100mm x 100mm x 37.5mm

Total of 10 x 20mm knockouts on the sides.