Stainless steel spacer, for use with shadow boards. The body of this standoff is 3/4'' diameter and 1 1/8'' long (leaving a 1 1/8'' gap between the wall and the shadow board). The spacer, and the bolt that holds the board, are solid stainless steel. A #8 screw (not supplied) is required to fix the spacer to the wall. Domestic spacers can look identical, but typically contain mild steel that will rust, and are hollow, making them microbial hot spots.