I got the 3.5 inch rise to get a wheelchair over a door threshold. When I bought it I didn't pay close enough attention to the weight in the description. It's nearly solid rubber, so it's a LOT heavier than I expected. But that also means it stays in place without the anchor bolts, at least for my usage, and it will support any weight I roll over it. It's not an ideal rise:run ratio (it's about double of the recommended for wheelchairs), but it's still definitely usable with wheelchairs. I thought at first that the bevelling of the sides was a waste of ramp space, but i have to say that it makes the ramp fit in. So, It's nice looking and functional, but if you have difficulty with heavy objects, get help to receive, unpack and place this.