Honing & superfinishing stones are manufactured in the undermentioned abrasive materials ,grain sizes ,bonds and hardnesses 
Aluminium Oxide              - 11 A

Semi refined Aluminium Oxide - 55 A

White Aluminium Oxide        - 30 A

Pink Aluminium Oxide         - 31 A

Green Silicon Carbide        - 70 A

Black Silicon Carbide        - 75 B
ABRASIVE
MATERIAL
Ke - Vetrified bond
Ba - Resin bonded
Stones can be impregnated according to honing requirements 		BONDS
 
Grain 30  - 180  Rough honing stones 

      220 - 400  Finish honing stones

      400 - 1200 Superfinishing honing stones
Grain
Size 
Very soft        180 - 250 

Soft              90 - 180 

Medium            45 -  90 

Hard               5 -  45
Hardness

How to order

Measurements and profiles according to DIN 69 186
Measurements are shown as
width x height x length

Special profiles can be manufactured from drawings.
Ordering example
Honing stones width 13 mm, height 12 mm, length 100 mm, Champfered both ends, in white aluminium oxide, grain size 100, hardness 75, virtrified bond, impregnated with sulphur.
Width 13 mm Abrasive material 30 A
Height 12 mm Grain size 100
Length 100 mm Hardness 75
Profile C Bond
Impregnation		 Ke
S (Sulphur)