Aluminum enclosures junction box with four Nickel-plated metal screws,color gray, lock type: nut,surface-mounted enclosure. Details: 1)Cast aluminum waterproof box, high compressive strength, sturdiness and durability, high temperature resistance, corrosion resistance, waterproof, dustproof, can be used in harsh environments, safe and secure. 2)The bottom mounting hole comes with thread, which is convenient for the installation of various equipment. 3)Can be equipped with mounting base plate according to customer needs,(The bottom plate needs to be purchased separately). 4)There is a threaded mounting hole on the back of the enclosure for convenient mounting bracket.