Popular Threshold wheel Chair or Floor Transition

hi buying 1  popular wood unfinished handicap doorway thresholds 12 inch wide 36 inch long 7/8 inch high i can make these any size you need these made for a mobile chair so it don't tip over going down between different floor heights  if you need a special one made send me your sizes i'll get back to you with a price  thanks john  PS I'll stain and finish this if you want it just send me message with color of stain i have all colors of stain and finish coated with 3 coats of clear laqure