How can I attach a draft seal/excluder to a garage door
Your drill should definitely handle a 2 mm drill bit. Make sure it's a drill made for metal. Use a nail and hammer to countersink the hole. Then follow with the drill. I have always used a drop or two of oil, (3 in One works great), when drilling as it will cool and lubricate the surface as well as prolonging the life of your drill bit.