T-Grid Mounting Clip For Heavy Duty Telescoping Box Bracket, For Use With Heavy Duty Telescoping Box Bracket (TB1624HD) To Install Junction Boxes, Fire Alarm Devices And Strobes Between T-Grid Using Box Mounting Plates, Snap-On Design Eliminates The Need For Attachment Screw To T-Grid, Boxes Can Be Easily Positioned Between T-Grid By Sliding Across TB1624HD, Accommodates Ceiling Tile Up To 1-1/4″ Thick, Clip Snaps Onto TB1624HD And Fastens With One Screw (Not Included)