by McDave » Tue Jul 04, 2017 1:43 am
Sometimes they are called security Bristol bits or Polydrive bits. But tamper proof torx seems right. I have a set of 1/4" and 3/8" drive bits, but they are not security, no hole. Let us know if HD has them, I'll need one for the ramp.
Thanks,
McDave
Is that the nut maybe? I've seen those on carriage bolts.