How to cut a slot in a steel plate?

How to cut a slot in a steel plate? 5mm slot drill cutting slots in 5mm steel? am i right in thinking you can get drills which drill a hole, and then half way up the shaft its got some kind of ff power4 slot Do not sand, drill, file, or remove parts Do not install incompatible forks ALWAYS IN SLOT Di2 WIRE: OPPOSITE SIDE OF REAR BRAKE REAR BRAKE

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