Measuring Tape Metal
The end of a measuring tape has a small piece of metal attached to it to help you when you are working alone. You can wrap the slot around a nail in order to keep the tape in place. You can also use the serrated edge to mark the surface.
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Pen Cap Holes
It is easy to assume that the pen cap’s design is wrong due to the hole in the cap. However, there is actually a purpose for the hole. It was installed there to allow air to freely flow in in case a kid or an adult accidentally swallows the cap. This makes sense because many people like to put the cap of a pen in their mouths while deep in thought!