Prairie View Industries TH2432 Threshold Ramp, 24 in x 32 in
This small threshold ramp is designed for doorways.  Made of aluminum and surfaced with anti-slip traction tape it is lightweight yet durable.  This will accommodate a threshold heights of 1 1/2" to 3".  Holes are pre-drilled in the top corners for easy installation.  Comes complete with hardware for securing in doorway.