Matthew Poole and continuators on Job 19:24

24 That they were graven with an iron pen and lead , in the rock for ever!

Of which also there is mention, Ier. 17. 1.

Or, or lead; or with lead, the Particle and being oft so used; as Gen. 4. 20. Exod. 1. 6. Ier. 22. 7. For this Lead may be either 1. the Writing-pen which might be either of Iron or of Lead: For though Lead be of it self too soft, yet there was an Art of tempering Lead with other Metals to such a degree of hardness that it could pierce into a Rock; as they did also temper Brass, so that they could make Bows and Swords of them. Or 2. the Writing-table: for the Ancients did use to write divers things in Lead, as is well known. Or 3. the Writing-Ink, as I may call it: For they used to grave the Letters in a Stone with an Iron Tool and then to fill up the Cuts or Furrows made in the Stone with Lead, that the Words might be more plainly seen and read.