I tried 3 of these with same results. Only 2 of these bits were ever used as far as I can tell or not used enough to matter.
Every bit just spins with no Bite. I believe its a matter of pressure. I am only putting mild pressure against it for fear of deforming the mag so I think the fix is finding some scrap to stick inside to support putting more pressure on it.
https://mega.nz/file/3GRFBCxC#H2UllA2K1TjYT4yscitly2fa00E9tV61If5d9eSRMHs
You are correct, it will take quit a bit of pressure to get the bit to bite.