A dowel is a hollow cylindrical tool used to accommodate bolts and thus serve as a support for bases. They are placed in pre-drilled holes where they are tightened by the twisting action of screwing in the screw. They are used to attach objects to structures such as walls.
These useful masonry pieces allow for easy attachment between objects and structural elements. With a well placed dowel you can hang pictures or mirrors without fear of them eventually falling. They also allow shelves, tables and hanging doors to be securely attached. They are a must in the drawers of DIY fanatics.