To assemble the Screwdriver Holder, place the back piece on a stable surface. Insert the tab of the smallest piece into its slot with the flat side facing the top. Use a rolling motion to insert the piece, starting with the bottom of the tab. This piece will support the screwdriver shelf. Once you have your support piece in place, insert the shelf piece into the base using a rolling motion. The slot is slightly curved to make pieces lock together very firmly. It is best to insert one end of the tab into the slot first, then roll the rest of the piece into the slots. For permanent assembly, glue may be required. For assistance with assembling 3D wooden products, click here.