Our brackets are made to professional standards. Each bracket is made 100% in house from design to CNC cutting and TIG welded in a fixture using a 6 axis welding robot. What this means for you is repeatability. Each bracket that comes from us is guaranteed square and precise. Hole spacing is perfect every time. Which makes things EASY. 12" Brackets are CNC cut with perfect spacing and precision accuracy.Made with 3/16" steel back plate and 3/4" diameter solid steel support rods.Solid steel construction means these are ultra heavy duty. No sharp corners! The support rods are 6 1/4" long making the minimum shelf depth 6 1/2" These brackets will support shelves from 6 1/2"-14" deep. You can easily add more mounting holes if needed with a 3/16" drill bit. We HIGHLY RECOMMEND mounting the bracket into the studs. Our brackets are stack-able, use multiples in series to support longer shelves. 100% MADE IN THE USA • 150 lb max capacity per bracket placed correctly in the studs• See our other listings for 24" and 32" brackets!