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 91428 1/2" W x 12" L 60 Grit A/O DynaCut Belt, 50/pack
3M 09019, General Purpose Sanding Sheets 9019NA-CC, 3-2/3 in x 9 in, Assorted Grit, 7010341429, 6 Per Pack
Insize 4131-1B1, AMERICAN STANDARD THREAD PLUG GAGE, 1/4-20UNC, 6928640358944
3M 30687, Cloth Belt 577F, 36 YF-weight, 3/4 in x 18 in, Fabri-lok, Single-flex, 7010308881, 200 per case 