They look good, seem well made. An important topic. It is indeed an M6 thread, but the thread depth is not suitable for everything. I've tried using them with Slice Engineering Mosquito but the filaments are too long to get into the thermal block. The Slice steel bit is a perfect match for both, so just by looking at them you can tell the difference in how the threads are made. On the other hand, it fits perfectly with the MK8 hotend for my Ender 3.
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