Found these about five years ago in a Watchcrafter’s catalogue. They are about “1 1/4 " long with a ring around them( For grip). The ring has both a specific color and the bit size marked on it. Now, I have heard them called " Aircraft Bits” Dunno about that! I do know they are difficult to handle sometimes, But, always drill straight and true, no matter how small they are.
The thing that surprises me, Like my Tamiya Bits they aren’t seeming to get dull any time soon? Whoda Thunk? The Above described bits also come in handy little racks! Oh! And they fit the chuck on my Tamiya handle too!
Harbor Freight Tools sells them. Industrial Carbide Micro Bits 1/8 shank size so they will fit in a standard Dremel collet. There are two types; drill and grinder burr. I use the latter to resize and refine holes. They are carbide so they stay sharp, but the smaller diameter sized ones can and do break even under finger pressure
The contents of the packages vary as to what is coming off the product line at the time. Trying to check the contents through the translucent packaging can be problematic. Out of multiple purchases I have cobbled together sets of drills and burrs.
And BTW, there is a hand-held 1/8" collet handle available into which the shank fits. Makes it a bit more robust and easier to turn than just twirling the bit between the fingers, with the inherent rocking motion which may be imparted. I’ve snapped many bits this way, especially thru tougher materials
1/8 shank size so they will fit in a standard Dremel collet. There are two types; drill and grinder burr. I use the latter to resize and refine holes. They are carbide so they stay sharp, but the smaller diameter sized ones can and do break even under finger pressure