How Small a Hole Can Laser Drill? Mechanical drilling hits a wall around 0.2mm diameter: drill bits below that size break regularly, wear out within hours, and require peck cycles that slow production. A precision laser drilling machine removes the drill bit entirely. It uses a pulsed Nd:YAG or fiber laser to melt and vaporize material, producing holes from 0.02mm to 1mm diameter in metals, ceramics, and hard alloys. Hole-to-hole consistency does not drift with tool wear, and