The universal crossbars are made of high-quality alloy steel: durable and rust-resistant to ensure safe use and reliability for a longer lifespan. This lamp mounting bracket adapter is designed to attach fixtures and canopies to electrical junction boxes. The 2-pack can satisfy your various needs, you can use it to mount wall lamps, ceiling lamps, LED lamps, pendant lamps, and chandeliers, ceiling fan lights, etc. The 4-inch diameter universal mounting plate fits most ceiling lamps. Including ground screws, terminal blocks, and crossbar screws, you just use it to mount lamps without buying other mounting equipment. Color: silver Material: alloy steel Package contents: 2 X lamp crossbars 4 X crossbar screws 2 X ground screws 6 X connectors 4 X black cap nuts 4 X lock nuts 4 X flat washers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.