Smart Nail / Nail

When using normal nails, users don’t know how deep the nails go into objects. Therefore, when users want to nail these nails onto walls or objects in equal heights, they often feel troubled. Consequently, this design puts forward the cheapest and the easiest way to solve the problem so as to let the users achieve their goals without changing habit of using nails. Smart nail has identical appearance as normal nails. It features various colors painted on it. Every color block is 5 mm high. Users can observe the block(s) of color to calculate and control the depth of the nail into the wall (or the height above the wall).