Japanese natural whetstone Nakayama red Nashiji ~ What do the specs mean?

Curious if anyone here knows what these stats mean?
Can you tell what grit it is etc?

Quote:

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[Max size] 85*140*22mm (25.4mm=1inch)
[Net Wt.] 552g ;approx. equal to 1 2/9lb (454g=1lb)
Hardness/Grit per hardness/Abrasive pow./Lightness of touch (H1=softest ,H5=hardest)
HGAL=4/max/max/max ...Honyama stones born in central Kyoto city are known as the highest class plates

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Thanks for any insite

The rest of this thread has been moved for mod discussion, as it went way off course

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