3M Bristle Disc Mandrel 27680 used on a bristle disc that is 1" or smaller in diameter with a 1/16" center hole, for attachment to a 3/32" drill or collet chuck. The two-piece mandrel has a bolt that is inserted through the center hole of the bristle disc and then tightened into a threaded spindle. The spindle can then be inserted in a 3/32" collet chuck or drill.
Here is a vintage box of 50 Star SnapIn toggle bolts. They are 2 inches long, and the bolt is 1/8". They have "M" heads, which are very thin and slotted.
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