The drill bits are very very delicate but when used carefully with a pin vice they are very usefull. I have used them a few times in the Revel U-Boat and they are superb for drilling very small accurate holes in polystyrene for such things as rigging.
Roll the pin vice very gently between your thumb and second finger and use your index finger to control the direction and the pressure on the drill. You will be surprised at how well they work. | 
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