Hebrew טֶפַח. Literally "a palm". Also called Tefach, Palm.
The width of four fingers at the palm: a sixth of a cubit.
Length
7.41–7.62 cm (2.92–3 in).
Defined as 1/6 of a cubit.
Inherits the disagreement over the cubit.
The handbreadth is the width of the palm, four fingers across, and it is the unit the difference between the two cubits is expressed in — Ezekiel's royal cubit is an ordinary cubit plus one of these. It is also the thickness of the bronze Sea in Solomon's temple, and the measure the psalmist reaches for when he wants a life to sound short.
The body was the ruler: four fingers make a handbreadth, three handbreadths a span, two spans a cubit. The finger is named as a measure once, the thickness of the temple’s bronze pillars, four fingers (Jeremiah 52:21); the handbreadth is the thickness of the bronze Sea (1 Kings 7:26), and the psalmist’s you have made my days hand widths (Psalm 39:5).