Threshold Ramp 3 All threshold ramps are: For scooters and wheelchairs to make doorways sliding glass doors and raised landings easy to travel over * Easily installed * Made of extruded anodized aluminum that will not rust or corrode * 600 Lbs. weight capacity * Limit of use: 2 3/4 to 3 1/4 * Lengths: 17 * Used for sliding doors thresholds raised landings etc. * Dimensions: 17 L x 34 W