These toolholders are designed/made for the TeknoMotor ATC. They should also work in HSD ES915 and other ISO30 machines. But when working with high RPM (24,000), always verify the fit is 100% correct.
The balancing of these tools is done to a very high grade, and that's why it can run up to 24000RPM. Be very careful when using standard ISO30 toolholders in ATC motor, since most are only balanced up to 8000RPM.