Hebrew אֶצְבַּע. Literally "finger". Also called Etzba, Fingerbreadth.
The smallest length named: a finger's width, a quarter of a handbreadth.
Length
1.85–1.9 cm (0.729–0.75 in).
Defined as 1/4 of a handbreadth.
Inherits the disagreement over the cubit.
A finger's width is the smallest unit of length the Old Testament names, and it appears just once as a measurement — the thickness of the bronze pillars Solomon set before the temple, which Jeremiah records as four fingers.
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).