The 12T is a good solid base. Very happy with the purchase. I just used it for an LED light upgrade, which had come with a smaller base. The modified light now sits solidly on the side of my lathe. The upgrade took me a while to figure out, so I'll share what I learned.Previously, I purchased an LED light with the smaller magnetic base, but it was insufficient for my use case: attaching the light to the side of my lathe. The light kept falling off. So I ordered this 12T base which has significantly more holding power.I unscrewed the LED light from the smaller base, unfortunately my light had M10 (approximately) threads. So I bought an M10 (female) to M8 (male) adapter (look for motorcycle mirror adapters). The male M8 end fit solidly in the base, but the screw was too long, so I shortened it using a hacksaw. Otherwise you risk interfering with the magnet’s internal lock/unlock mechanism.The female M10 end, which attached to my light was close but not perfect. (Maybe a fine vs. coarse thread issue?) So I smeared two part epoxy into the female end of the adapter and then screwed in the LED light tightly. The connection with the adapter is now very solid.When I screwed the light into the base I put a dab of superglue on the threads of the M8 adapter so it wouldn’t come loose from the base when I adjusted the light. (just a dab, be careful to not get superglue into the interior of the magnet or you could freeze the lock/unlock mechanism.) Pretty sure I could use acetone and/or a wrench to loosen the superglue if I ever need to get the light off the base, but I haven't tested this.As I said, it took me a while to figure all the above out. It isn’t bad as it sounds. To do it again would take a few minutes, so I’m sharing here for the one or two people who are trying to do something similar :)Finally, I’m not sure if these bases can be found with holes other than M8, but you might want to seek them out, if needed for your use case. I could have avoided a lot of hassle if I just found a base with the right size hole from the start.