Commercial grade caster base shall be Middle Atlantic Products model # CBS-WRK-32 to accommodate WRK Series 32" depth racks. Caster base shall be constructed of 11-gauge steel. Caster base shall be 4.03"H x 20.97" W x 29.34" D and have a weight capacity of 1300 lbs. Caster base shall have one knockout in the center of the base for cable pass-through measuring 9-1/2" W x 18" D. Caster base shall raise total rack height 15/16". Caster base shall be finished in a durable textured black powder coat. Caster base shall be UL listed in the U.S. and Canada. Caster base shall be GREENGUARD Indoor Air Quality Certified for Children and Schools. Caster base shall comply with the requirements of RoHS EU Directive 2002/95/EC. Caster base shall be manufactured by an ISO 9001 and ISO 14001 registered company. Caster base shall be warrantied to be free from defects in material or workmanship under normal use and conditions for a period of 7 years.