This is a table brace made by ScopeSaver which supports their Reference Table/Laptop Table. This attaches to the original ScopeSaver plate, and then clamps to the tripod leg (no drilling required) and support the table in vertical direction, preventing sag and potential of laptop sliding off into the night.
This has never been used and is NIB, comes with manufacturer's instruction sheet. Bar is black anodized and clamps are stainless steel; definitely a quality product. I don't know full range of tripods this fits, but it does work with the Meade LX200 field tripod. I bought this a couple of years ago when price was $18 plus S/H. I don't know if it is still made. I will ship this to you within conus for $15.00