There is a reason for the hole.
While there is a universal need among craftsmen for a portable measuring tape, none of these combine functionality with a fashionable design. METAPHYS bagel is designed to be both portable and fashionable, and its donut-like shape provides a central hole that allows for a better grip while also functioning as a strap hole.
The shape fits the fingers.
Its round shape fits the hand and the dent in the center fits the fingers.