Saim Waterproof Plastic Electronic Project DIY Junction Box Enclosure Case 230mm x 150mm x 85mm Surface Mounted, waterproof sealed plastic electrical enclosure switch Junction box External Size: 230 x 150 x 85mm/9.1" x 5.9" x 3.3"(L*W*H); Internal Size: 220 x 140 x 75mm/ 8.7" x 5.5" x 3"(L*W*H) Fixing Hole Diameter: 6mm/0.24" This junction box provides complete protection against dust and splash water, the Ingress Protection Rating is: IP65 Great for electronic projects, power supply units, student projects, amplifiers, etc.