STEP 4: Drill holes for pots Finally, it was time to drill the holes for the terra cotta pots to fit into. I used a 3 3/8″ hole saw attachment for my drill, ensuring that the drill bit on the inside of the hole saw was directly on my marks.
STEP 5: Paint shelf Once all three holes were created, I applied a coat of white paint to the board/shelf. I let that dry completely, then applied a second coat. Make sure to get all the nook and crannies of the wood, especially on the inside of the holes and the outer edges.
STEP 6: Drill hole for shelf and attach to wall Next, I made a starter hole for the screw that would mount the shelf to the wall. I did this by using a 3/4″ paddle bit–this will create a divot that will allow enough space to drill the screw into so that the screw isn’t jutting out and restricting the middle terra cotta pot from sitting nicely in the hole. Do not go all the way through with the paddle bit–you only need to drill in about 1/4″ or so.
After the divot was created on the inside of the middle hole, I took a 3/16″ drill bit and pre-drilled a hole through the back of the shelf (make sure it’s on the back side of the divot you created).
Next, I manually tightened the screw into the middle hole from the inside, just enough that my right angle attachment would be able to fit in order to mount the shelf to the wall.
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source: hometalk.com