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HEIKENEI ERT 16 DIN371 M3 - DIN376 M5 GRADE-1 TAPPING COLLET 10 MICRON RUN OUT DIN 6499 / ISO 15488 THE SQUARE AT THE BACK OF THE MACHINE TAP PREVENTS IT FROM COMING OFF ITS PLACE WHILE ROTATING, AS IT FITS INTO THE SLOT UNDER THE SHANK.