One 1/2 in bottom conduit knockout, four bottom cable knockouts. With armored cable/metal clad/flex clamps. Adjustable plaster ears allow box to be used in old work applications. Acceptable for use in 2 hr rated walls. 2-1/2 in D. 12.5 cu-in. UL listed. UPC bar coded. Unit: EA UPC: 050169005187 Model Number: 518/8518