Expandable Road Barrier 1. Folding and Expanding 2. Wheels possibly in the bottom ... the flank 4. Original Patent Product: Expandable BarrierBrand: MAXPANDModel: B2TMaterial: Steel, Aluminum, Aluminum alloy, etc.Color: Red, White, Yellow, Black, etc ... . OEM AbilityUsage: Using as Isolation, Protection, Caution tool.Fit Place: Road, Street, Highway, Shopping Mall, Gas Station, Parking Place, Garden, ...