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                | MODEL 
                  NO. | OUTER 
                  DIAMETER | DIAMETER 
                  TOLERANCE | DEPTH OF 
                  EFFECTIVE HARDENED LAYER | WEIGHT(kg/m) |  
                | g6 | h6 |  
                | Si4 | 6.35 | -0.004 -0.012 | 0 -0.008 | >0.6 | 0.25 |  
                | Si6 | 9.525 | -0.005 -0.014 | 0 -0.009 | >1.0 | 0.56 |  
                | Si8 | 12.7 | -0.006 -0.017 | 0 -0.011 | 1.0 |  
                | Si10 | 15.875 | >1.5 | 1.55 |  
                | Si12 | 19.05 | -0.007 -0.020 | 0 -0.013 | 2.24 |  
                | Si16 | 25.4 | 4.0 |  
                | Si20 | 31.75 | >1.8 | 6.21 |  
                | Si24 | 38.1 | -0.009 -0.025 | 0 -0.016 | >2.2 | 8.95 |  
                | Si32 | 50.8 | 15.9 |  
 |