I guess it all depends on what a "light load" is. I had to install spur shelving today, four bookshelves four feet long supported on two uprights fixed to the sheetrock. I figured four inserts on each upright would be ample, and I hope I am right. But I would not use them to hang kitchen wall cabinets, for example.

While I respect gnu's professional integrity, Tweed has a point, almost everything that gets built is always constructed far stronger than it actually needs to be. ( except bridges in Minnesota ....)

thanks for the link, kat, I will email them immediately