This ceiling light plate can be mounted on the ceiling floor to hang or hold the chandeliers, ceiling lamps. Widely used on home, office, bookstore or other somewhere. Round Hole Size: 10mm / 0.39"; Oval Hole Size: 24x5mm / 0.95"x0.2"; Hole Distance Range(Size A): 56mm to 96mm / 2.2" to 3.78"; Overall Size(Size A): 104x18x17mm / 4.1"x0.71"x0.67" (L*W*H); Hole Distance Range(Size B): 35mm to 82mm / 1.38" to 3.23"; Overall Size(Size B): 90x18x17mm / 3.54"x0.71"x0.67" (L*W*H) Made of galvanized iron material, good rust resistance, long service life. Fasteners like screw and nut will help to fix the chandelier on the ceiling wall firmly. Easy to use, just screw this ceiling light plate into a round ceiling light base. Please check the size before buying.