26012BK Finish: Matte Black, Size: 12 Features: -Plain Track.-6063T-5 structural aluminum extrusion; average wall thickness .08.-spring steel. Black or white nylon coated to prevent rusting and marking ceiling. Furnished with track unit.-"U" shaped copper conductor, increases contact surface area minimizes contact resistance provides reliable positive connection.-Furnished with track unit.-Molded thermoplastic.-0.06" Extruded aluminum, one screw mounting, one screw tightening.-0.38" Gap helps to compensate for ceiling irregularities. Provides rigid support for dense loading of track. Options: -Available in Matte Black or Matte white finishes.-Available in 48" Width, 96" Width, 144" Width size. Dimensions: -0.040" Wall, high temperature extruded thermoplastic.-4" Width dimensions: 1.63" H x 48" W.-8" Width dimensions: 1.63" H x 96" W.-12" Width dimensions: 1.63" H x 144" W.