Gorilla Post with Magnetic Base - add on kit: This kit includes 1 Gorilla Post Magnetic Base with GPPlateA steel base plate suitable for concrete or asphalt and GPEpoxy for attaching plate to concrete or asphalt. The 48 inch Magnetic Base Gorilla Post represents a standard but effective unit made of durable polyethylene plastic that is resistant to ultraviolet light, ozone and hydrocarbons. Can be used with 12-inch-wide x 18-inch-long plastic signs. Base plate is under 1/4-inch thick so is ADA-compliant when temporary bollard is not in place. ALERT: This kit does not include a removal tool which is included in the Starter Kit. A removal tool is needed to de-couple the magnetic base from the base plate.