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 87449 Silver Depressed Center Grinding Wheel, T27 Quick Change, 9 in x 1/4 in x 5/8-11 Center Hub Thread, 7010409732, 20 per case
3M™ 07012, Supplied Air Hose W-9435-100/07012(AAD), 100 ft, 3/8 in ID, Industrial Interchange Fittings, High Pressure, 7000005375, 1 EA/Case
Standard Abrasives 712149, Aluminum Oxide Handy Roll, P100 J-weight, 1-1/2 in x 50 yd, 7010295370
3M 27468, EMI Copper Foil Shielding Tape 1181, 1 in x 18 yd (25,40 mm x 16,5 m), 7000132169
Insize 7351-1EX14, LONG HANDLE, length 77.8", 6928640370687
3M 15060, Roloc + Button 7, 3/8 in Red, 7000045945
Dynabrade 95746 3/8" NPT Speed Regulator
3M 27707, Cubitron II Roloc Durable Edge Disc 984F, 36+, YF-weight, TSM, Maroon, 4 in, Die RS400BBM, 7000119217, 100 per case
3M 64808, Scotch-Brite EXL Unitized Mounted Point, W185 x 1/8 in 8S FIN, 3M 7010310009
Dynabrade 97571 1/2" NPT Male Safety Coupler
3M 20942, PSA Cloth Disc 348D, 80 X-weight, 3/4 in x NH, Die 75K, 7000118911 