The D-1 series is perfect when the application only has one very small wire. Typical runs would be a phone line or high gauge wire (14, 18, 20, or 22).The D-1's come 'UNSLIT', but can be slit by the end user with the proper tools and safety precautions. With a narrow design and low profile the D-1's can handle vehicular traffic. Part#D-1-12 Channel H 1/4 x 1/2 W (inches). Height 7/16". Width 2-3/4". Length 12' Weight 5(lbs). Colors: Black, Brown.