These photos are exactly what "Twist Drills" look like when they are 'tool store bought'. With a drill shaft of 3/32" of an inch in diameter. They are the best and easiest tool for drilling holes they are also easy to hold in the flex-shaft.
As you can see that under normal circumstances it is imperative to have a large inventory. My inventory consists of numerous size of drills, if one drill got worn or broke, I could quickly change to another similar sized drill.
Drilling holes is a precarious adventure that requires a steady hand. Drilling easily heats up the metal in seconds, a lubricant is required during the drilling process.
To allow the drill to not to slide about I suggest drilling a small round bur indentation into the metal, then start to use the twist drill. ALWAYS HOLD THE DRILL IN AN UPRIGHT (VERTICAL) POSITION.
This diagram explains how the twist drill appears.
Under greater magnification, these are the wide assortment of drill sizes.
This assortment of twist-drills is what we use on a regular basis. The dimensions that I prefer start at 0.39 mm's all the way up to 1.14mm's. If you choose a larger size of drill, so be it.
This a greater 200x power magnification of a 'broken twist drill', as you can see that the top of the drill broke off. How can it be repaired? (Just go to the next photo).
To repair a twist drill at your bench is quite easy. DON'T THROW IT AWAY, REPAIR IT.
I suggest using your 'Snap-On, Emery wheel with a "Medium" grade paper. Just recut the "twist" and its DONE.
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