Nordic Fiberglass manufactures ground sleeves for traffic controllers, called GSTs. GSTs are available for many models of traffic controllers. GST exterior is covered with a Mist Gray or Munsell green gel-coat. Gel-coat contains UV stabilizer for superior resistance to weathering. Large GST models incorporate a walking surface for workers to step off of dewy grass and onto a clean surface. Stainless steel floating nut inserts are available to match up with the control’s bolting pattern.