H = Type (A- angle, H- horizontal, V- vertical)
30 = Free Speed RPM (x 100)
B = Type of Wheel (B- wire brush, F- polishing head, W- sanding head)
10 = Arbor Diameter (10- 5/8â€-11 Thread)
6 = Wheel Diameter in. (6, 7, 8, 9)