I got these to replace the stock rear wheel pins on my old RC10T4 Factory Team. They will not stay in the rear axle hole. Either the pins are too small in diameter or the holes in my axles are too large in diameter. However, the old pins stayed in just fine, so I'm assuming that the holes in the axles are the right size.
The good news is that I was breaking my old axle pins (ASC7369) with just a 13.5T brushless/2S-Lipo set up. I broke about 3 of the stock pins before I switched to these and haven't broken one since.