VNN Portable Wheelchair Ramp 4FT, Non-Slip Aluminum Folding Handicap Ramp, Door. 4FT Wheelchair Ramps are available for 4 inch -12 inch step heights only. ? Note: Please refer to the buyer?s guide to select the wheel chair ramp for home steps size before purchasing; Please notice that it is normal for the long portable wheelchair ramp to sink during use, and it will rebound soon.Please do not exceed the maximum weight capacity of this wheelchair ramp 600 lbs. Double Non-skid: the aluminum surface of the wheelchair ramps for home is designed with folds to increase friction. The surface is also covered with non-skid layer for double non-skid protection. The handicap ramp can be fixed on the wooden platform with complimentary screws. Portable Comfortable: the 4 foot wheelchair ramp is made of advanced aluminum material, which is firm and light, and can be folded for easy carrying and storage. The materials of the handle are newly upgraded, which are so firm and comfortable that it can prevent hand scratches. Safety: stainless steel hinges used on the ramp can prevent corrosion and rust to ensure the durability; Both sides of the wheelchair ramps are equipped with baffles and reflective warning stickers to prevent accidental falls. The transition plates at the top and bottom of the ramp make the ramp better fit the ground. Wide Range of Applications: portable door threshold ramps can be used at front doors of home or garage steps and various cars to solve problems that may happen to wheelchairs, unloading trolleys, baby carriages, pet dogs, scooters and elderly people walking