A-1

Grade #3 Diamond

Lens/Mirror

0 – 1

–

A-2

Grade #6 Diamond

High Polish

1 – 2

–

A-3

Grade #15 Diamond

High Polish

2 – 3

0 – 5

B-1

600 Grit Paper

Medium Polish

2 – 3

6

B-2

400 Grit Paper

Medium Polish

4 – 5

7 – 8

C-1

600 Stone

Low Polish

10 – 12

11 – 12

C-2

400 Stone

Low Polish

25 – 28

13 – 15

C-3

320 Stone

Low Polish

38 – 42

16 – 17

D-1

Dry Blast Glass Bead #11; 8” distance at 100 psi; 5 secs

Satin Finish

10 – 12

18 – 19

D-2

Dry Blast #240 Oxide; 5” distance at 100 psi; 6 secs

Dull Finish

26 – 32

20 – 29

D-3

Dry Blast #24 Oxide; 6” distance at 100 psi; 5 secs

Dull Finish

190 – 320

30 – 45