Nesting stand-offs are used for glass to glass applications. The two most common techniques are using the standoffs to stack multiple firings of glass and or to hide make an overlapping seam to make a multiple firings appear as one single piece of glass. Combining these nesting stand-offs with the other Hang Your Glass wall mounts makes for a truly unique piece of art with lots of dimension. Nesting stand-offs detach for shipping and cleaning. Choose the diameter that is proportional to the piece of glass that is to be nested. Recommended for glass less than 8″ Patented. Made in USA.