We've found that needle files are occasionally useful for pen making - removing the odd burr here and there, chamfering a component, fine detailing on a blank, widening the hole where a refill doesn't quite poke through, and so on. In addition to that though, they are indispensable in the workshop for general use, for all sorts or purposes, and once you own a set, you'll possibly wonder how you ever got by without one.
Our needle files are hand cut, and are available in either cut 0 (coarse) or cut 2 (smooth). There are 12 files in each set, comprising Hand, Flat, Round, Half Round, Square, Three Square, Knife, Barrette, Crossing, Slitting, Jointing & Half Round Marking.