Steel octagon boxes 4 inch - drawn construction. Four cable pryouts and one 1/2 inch KO side, one 1/2 inch KO bottom. Octagon boxes are used in the installation of ceiling or wall light fixtures. TS bracket features gauging tabs and recessed nailing spurs, for wood or metal studs. Acceptable for use in 2-hour fire rated walls and ceilings. UL Listed. SteelNon metal clamp bracketsOctagon Box1-1/2 in. DeepDrawn with Nonmetallic Sheathed Cable ClampsTS Bracket for Metal or Wood Studs1/2" knock outs15.5 cubic inches1-1/2" deep with nonmetallic sheathed cable clamps4" diameter