1mm Precision drill bit, it does drill 1mm not what you find out there drilling bigger than what they are advertised.
Can be used with a hand held drill bit holder or with a power tool.
Please note, being so small they are extremely delicate and any drilling done at angles using an hand held drill bit holder they will break.
1 piece for packs of 10 units see linkĀ https://scalelabmodels.com/product/1mm-precision-drill-bit-pack-of-10/