TreeKeeper's universal rolling artificial tree stand will fit 7.5 - 12 foot artificial trees with base diameters between 1-1/4" and 2-1/8". Protective collar for additional support and protection of your trunk. Features 4 durable plastic wheels, metal casters and 2 wheels that lock to secure position. All 4 legs adjust in and out to accommodate wide, tall trees and smaller, more compact trees. Stand is made from a durable plastic with a metal collar to house your tree's post and metal casters.