First, I am not a contractor or professional builder. Just a DIY homeowner. I had to build a section of fence on top of a log wall and as my house is on a hill it has moved a bit over the years, not 100% level. I used them and a level to achieve this. what i like about them They appear to be made out of non-biodegradable material and have spots where you can easily resize them to the size you want. I don't know if they're inexpensive for a large job, but I used maybe 3 on mine and I have dozens left. You did what I needed. I'm sure they can handle a lot of weight too.