"Add a smooth transition to any threshold or small step with the Silver Spring solid threshold ramp, exclusively from Discount Ramps. Pre-drilled mounting holes make it easy to create a long-term transition over short rises up to 4"" in both indoor and outdoor settings. Low-profile curbs ensure that you'll be able to swing doors over the ramp with ease while a grit coated surface provides the traction you need in any conditions. When you're on the go, take advantage of its one-piece construction and easily place the ramp in the homes of loved ones, vacation destinations, and other locations that will benefit from this safe, secure, and versatile mobility solution."