I've used these for several jobs in only a short time. They are small drill bits, but that is the point of a MICRO set. I have used these to create holes to insert wiring on 1/48 scale radial aircraft engines, to hand-build 50 cal machine gun ports that were inexplicably absent on a WWII fighter plane, and to repair an old P-51's broken landing gear strut by hollowing it out to insert a small metal shaft. They worked flawlessly, and I would not hesitate to recommend them for this kind of crafting.
"use with caution"
PATRICK.PAGADUAN
I used the bits on a simple plastic model to create portholes on a ship. Three of the bits already broke.
"Magnum- Micro Utility Drill Set"
Dshannon1863 (Elkton MD)
Excellent product, well balanced for the small projects and ship models. the drill bits are sharp and strong.