Precision PCB Drill Set 0.3–3.0mm Carbide 10-Piece

10 carbide twist drill bits: 0.3, 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0mm. Pin vise handle included. Carbide shank; do not use in standard drill presses — these are for hand or PCB drill press use only. PCB drilling requires speeds above 10,000 RPM for clean hole walls; drill press use at 200–1,000 RPM will crack carbide. Works with FR4, phenolic, and PTFE substrates.