I bought this heater block sold by 3DMakerworld. If you buy from another third party, your results may vary. This block was a perfect replacement for my Prusa MK3S E3D V6 hotend and came with all the necessary screws and Allen keys. My original E3D nozzle and thermal break screwed in smoothly with no play, and there was no problem installing the heater and thermistor. Don't hesitate to buy again.
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