Buy a 5mm carbide stub drill with a 5mm collet and peck drill them with full retract .050"- .060" peck depth 30 ipm 10k rpm. Add air blast and some lubricant.
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Buy a 5mm carbide stub drill with a 5mm collet and peck drill them with full retract .050"- .060" peck depth 30 ipm 10k rpm. Add air blast and some lubricant.