New Work Ceiling Box, 20 CUIN Capacity, 4" Diameter x 2-1/4" Deep Blue PVC, 3/0 - 4/0 Combination, Captive Nails, 6 Integral Clamps, Fixture Spacing For 2-3/4" & 3-1/2", For Light Fixtures & Junction Boxes, Not For Use With Ceiling Fans.