What does 'ss' mean??
It means 'stone size'
All sizing from any manufacturer of stones is the same
ss4 1.5 - 1.6 mm
ss6 1.9 - 2.0 mm
ss10 2.7 - 2.8 mm
ss12 3.0 - 3.2 mm
ss16 3.8 - 4.0 mm
ss20 4.6 - 4.8 mm
ss30 6.3 - 6.5 mm
ss34 7.1 - 7.3 mm
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