Donny is on the money.
HarborFreight step drills are bullet proof.....I'm ten years into them as a full time fabricator. Deburring for free, all sizes in one handful, and ROUND holes. I'm sure Wurth and SnapOff are made in the same factory but six times the price.
YES....RotaBroaches in DRILL PRESS or MILLING MACHINE ONLY! They work great in a lathe too but be careful it doesn't jam. Careful the swarf comes off in all directions (not one direction like lathe tool).