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Is a 5/32 drill bit okay for 10-32 x 3/16 knurled set screws?
Far as I can tell it is a dimpling jig. Shallow. As in just the pointy part of the drill. End result should look like this. No actual hole. No verticle sides to the dimple.
5/32 drill bit size is the tightest tolerance size for 10-32. If you have a heavily coated fastener, a Friday fastener......... it may get tight. If you have a cheap fastener it may snap. #21 isn't hard to find out in town. I'd use 5/32 for aerospace level stuff with aerospace level fasteners if directed by spec. I'm not sure I'd trust a non sourced fastener for this.