Unlike the previous speakers, I can not recommend this dart tips by Empire Dart. The tips should be combined in duo box of EmpireDart the manufacturer without any problems with Chrome tournament darts. Both 2BA, but do not fit !!! The tips can indeed screw it but sit wrong. This are the threads have been cut wrong, none of the six peaks are completely screwed up behind against. I have chosen especially for expensive arrows, and thought the quality of the tips would be as well. Unfortunately a disappointment. The 3.90 shipping also an absolute impudence of this 6 tips.