Pre-fabricated cable tray junctions .187? have a grid pattern of 2" × 4" and are available in standard widths of 6", 8", 12", 18" and 24" with a depth/height of 2" or 4". All junction/intersections have a length of 3' Cm25 T Junction 6" W × 4" D. Hardware, Computer, Raceways & Wire Duct