This is a shelf with square corners, 8" wide as a standard, and a polished edge. It is 48" long and includes brackets. It is .750" thick. We can make any size shelf that you need so don't hesitate to send us a request. If the width is too wide just put in the notes field the exact width that you need. The thickness of the shelf will depend on how heavy the objects are that you wish to place on them. If the total weight is more than what we think the 1/2" will hold then we can make them out of 3/4" but in 95% of the cases 1/2" will be fine. If you want 3/4" we have added those to the drop down menu both with brackets and without. We also sell the brackets that will hold your shelves separately if you need those for another application. They are a separate item in our store. Call 800.200.4228 for support. Check out of YouTube channel for some interesting videos: https://www.youtube.com/channel/UC0ZIFYHOQ1bnf-B2Hg00mBA