3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 6898-150, MAGNETIC RECTANGULAR BLOCKS, 5.9×2.8×3.3″, pair, 6928640320965
$1,529.33
For grinding, light milling, drilling and inspection of round and square jobs.
Hardened, high accuracy, strong magnetic force.
Working surfaces are hardened to HRC58-62.
Magnetic force on top, bottom and back sides.
Supplied in matched pair.
Related products
Measuring/ Inspection Instruments
Insize 3231-4, NON MAGNETIC MICROMETERS, 3-4″, 6928640360503
$1,373.37