The shank is electrically conducted to the metal workpiece through the chuck and table,
the LED lights up and the beeper sounds(only for 6566-3E),
when the ball touches the workpiece
Not suitable for rotary use. Hardened shank and contact ball
Hardened shank and contact ball

3M 07394 Hookit Disc Pad, 178 mm x 25 mm M14-2.0 Internal, 7000045702
Insize 0010-A35, SOUND LEVEL METER, 35dB~130dB, 6974029777004
3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 