Reddit reviews Titanium Step Drill Bit Set Multiple Hole with Automatic Center Punch, 3-Piece Set | 4-32mm/4-12mm/ 4-20mm, High Speed Steel Drill Bits Set with Double Cutting Blades Design
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TITANIUM | HIGH SPEED STEEL: Classic High Speed Steel With Titanium Coating For Proven Capability and DurabilityTRI-FLATTED SHANK: Fits Into Power Tools Chuck Securely and Eliminates SlipSPLIT POINT TIP: Increases Cutting Speed With Self-Centering And Prevents WalkingDRILLING HOLES IN: This Multiple Hole 24 Sizes Hole Step Drill Bit Set can drill in Plastic, Aluminum, Copper, Stainless Steel and Many Other Types Of Sheet Metal (the board must be smaller in thickness than the height of step drill bits)TWO-FLUTE DESIGN: Clears Chips Faster and Allows Particles To Escape Easily, Smooth Cutting
You can either drill a 10mm hole and file it out, or get a step drill to widen it.
https://www.amazon.co.uk/dp/B073QSPND1/ref=cm_sw_r_cp_apa_rfRLBb3H0BKJC