Carlon B520P-UPC Ceiling Box 4 in W 4 in D 2-1/4 in H 1 -Gang Polycarbonate Blue

Ceiling box with captive nails, ground lug and screw attached. Fixture spacing for 2-3/4 and 3-1/2 in. 6 integral clamps. Listed for fixture support up to 50 lb. 4 in Dia x 2-1/4 in D. UL listed. Meets NEMA OS-2.