Msradell
Sawhorse
The only place I've seen those used around here are in highway construction. Just goes to shows it there different local standards in different parts of the country.I am aware there are nonmetal chairs, however, around here this is what is used
https://www.aftfasteners.com/produc...MJuWkWydn6WZ9nSRRIfi1BU3corYsXzxoCL4sQAvD_BwE