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

Dynabrade 78104 3" Dia. x 60 Grit A/Z DynaCut Locking-Type Disc, 2 Ply Cloth, 25/pack
Insize 7342-M0, PIN GAGE HANDLE (OPERATED WITHOUT WRENCH),0.3-1.5mm/0.011-0.060", 6940561971118
3M 20942, PSA Cloth Disc 348D, 80 X-weight, 3/4 in x NH, Die 75K, 7000118911 