They are professionally laser welded and have 10 treads.
Draper Car Ramps, 2.5 Tonne (Pair)
Draper Wide Car Ramps, 2 Tonne (Pair)
Car Ramps KATSU Plastic Car Ramps 2 PCs Garage Ramps lifting Automotive Vehicles
Heavy Duty 4000 lbs Car Ramps 2-Pack, Extra Wide Metal Maintenance Ramps Blue
Durhand Car Ramps 2.5 Ton Capacity Heavy Duty Motorhome Levelling Ramps
Heavy Duty 4000 lb Car Ramps 2-Pack Set Extra Wide Metal Maintenance Ramps Blue
