2-1/8 in deep, 4 in octagon boxes with back side tie wire tabs and (4) side t-bar slots and (2) 1/2 in bottom knockouts are used to install ceiling lighting fixtures, fans, convenience junction boxes and devices. Their break-away side tabs allow box to fit snugly on ceiling t-bar grid. The tab on back of the boxes allow tie wires to be secured to ceiling structures. Garvin Industries octagon boxes are made with a versatile combination head screw that can securely fasten a conduit to an electrical junction box using a slotted, Phillips®, or Robertson head screw driver. They also come with labor saving installation and mounting tabs that align with most lighting fixtures.