Norton Bear IB8 combination oilstone
A 2 sided Aluminium Oxide & Silicon Carbine combination stone,
Coarse, Grey Slicon Carbide (~180grit) side
Fine, Orange Aluminium Oxide (~400grit) side
200 X 50 X 25 mm
From the Manufacturer:
Crystolon/India Combination Fast-sharpening, medium grit silicon carbide (Crystolon) and fine aluminum oxide (India) abrasive surfaces for keen, long-lasting edges on quality tools. Crystolon side is dark gray in color, India side is orange.
