How do you cut Keyholes? Can I use drill press as mill?

30mm x 5mm HSS T Slot Cutter 8 Flute Blade Woodruff Cutting Alloy slot cutting drill bit for metal I drill holes but then use my Jig saw with some Bosch metal cutting blades and clean up with a rat-tail file These are 716 x 1 slots cut in slot storage box for car But solid carbide or tungsten carbide drill bits are needed to cut through hard, dense metals Also, check the drill bit's coating A TiN coating will slow down

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