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More about Threshold Ramps photos 
      Access4U Access for Living
Rests on threshold at top
This door opens inward
     Adjustable screw feet
Attach to top of threshold
Heights to 6 inches
Sits on threshold
Slip Resistant Aluminum
Lengths 2.5 to 6 ft.
Heights ½,1,1½,2,2 ½ & 3 in.
More about Threshold  Ramps Three types of Threshold ramp
Butts to threshold
Threshold Ramp -is supported by threshold itself
Adjustable Threshold Ramp -has screw adjustable feet
Supported Threshold Ramp - support underneath - fixed height and slope
Shown at sliding glass door
Fixed Slope 1:8