The wheelchair ramp is lightweight and portable threshold ramp, made from non-rust, slip-proof and water-resistant aluminum. The wheelchair ramps with plastic handle is not only portable, but also perfect for heavy scooters and electric wheelchairs. All locks in the wheelchair ramp are made of stainless steel. The bending degree of the locks in the ramp can be adjusted by using tools.You can use the locks to make the wheelchair ramp at any length you want. Durable aluminum construction holds up the wheelchaie ramp to 800 lb capacity. Aluminum material is relatively soft, the ramp may bend slightly when supporting heavy weight, but its resilience is high, please rest assured to use. Perfect for manual wheelchairs,heavy scooters and electric wheelchairs. Not suitable for mid-wheel drive chairs. Using height range of the ramp is 7.9''-23.6".Recommended using height is 15.7'',you can choose according to the actual situation.