Our Heavy Duty floating mantle and shelf brackets are the strongest brackets available. CNC cut from only high quality Hot Rolled P&O USA steel, posts are weld and back welded. If our standard offerings are not exactly what you are looking for then we are more than able to design and build anything custom you might need. 3/16" Thick base plate with 3/4" or 1"OD tubes in 4,6,8 or 12" lengths. Note: tubes may be solid or hollow. 4" Rods=5-8" Shelf/Mantle 6" Rods=7-12" Shelf/Mantle 9" Rods=12-16" Shelf/Mantle 12" Rods=13-21" Shelf/Mantle Note: Brackets are rated at aprx 125lb for each stud the bracket is attached to. CUSTOM LENGTHS ARE AVAILABLE UPON REQUEST.