"Easily overcome rises up to 4"" high in your wheelchair, scooter, or power chair with the Silver Spring Rubber Solid Threshold Ramp – perfect for use at home, at work, or anywhere mobility is an issue. These ramps have a 600 lb weight capacity. The solid rubber construction easily accommodates uneven surfaces and are great in all weather conditions due to their non-slip textured surface. These ramps have three channels on the underside to accommodate hoses, cables or other small wires"