1 1/2 inches in diameter.
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A millimetre: diameter of a pin head.
A diameter is a characteristic of a circular shape, and has no intrinsic size. A big shape will have a big diameter and a small shape will have a small one. For example, the earth's equator has a diameter of approx 12800 kilometres while a pin has a diameter of around 1 millimetre.
pin drawing pin pin point
the average pin number is 4
The P in PIN stands for personal.