B620KRUPC BOX, CEILING W/BAR HANGER | Ceiling box with 14.38 to 22-1/2 in adjustable bar hanger. 4 in Dia x 2-1/4 in D. Fixture spacing for 2-3/4 and 3-1/2 in. Integral clamps. Listed for fixture support up to 50 lb. UL listed.