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 90872 2" Dia. Coarse NWN DynaBrite Locking-Type Disc, 25/pack
Insize 1125-T101-1, Conical points (optional), 6928640376498
Dynabrade 78317 2" Dia. x 1" W x 1/4" Shank, Fine, NWN DynaBrite Wheel, 10/pack
3M 20942, PSA Cloth Disc 348D, 80 X-weight, 3/4 in x NH, Die 75K, 7000118911 