universal crossbars are made of high quality alloy steel : durable and rust resistant for ensuring your safe use and reliability for a longer service life.This light fixture mounting bracket adapter is designed to attach fixtures and canopies to electrical junction boxes. 2 Pack can satisfy your multiple needs, you can use it for mount wall light, close to ceiling light, LED light, pendant light and chandelier, Ceiling fan lights etc.4 Inches diameter universal mounting plate fits most ceiling lights. Including ground screws, wiring nuts and crossbar mounting screws, you just use it to mount light fixtures without buying other mounting hardware.color: silverMaterial: alloy steelPackage Contents:2 X light fixture crossbars4 X crossbar mounting screws2 X ground screws6 X connectors4 X black cap nuts4 X Lock Nuts4 X flat washersOnly 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 +/- 1-3cm.