Use both sides. Combination stones have fine grit on one side, coarse on the other.
Combination    Diameter
10.450                 4" x 13⁄4" x 5⁄8"
10.451                 6" x 2" x 1"
10.452                 8" x 2" x 1"
 
Fine
10.456                4" x 1" x 1⁄2"
10.457                6" x 2" x 1"
10.458                8" x 2" x 1"
 
Medium
10.461              4" x 1" x 1⁄2"
10.462              6" x 2" x 1"
10.463              8" x 2" x 1"
 
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10.451 INDIA STONE 6" X 2" X 1" COMBO
10.452 INDIA STONE 8" X 2" X 1" COMBO
10.457 INDIA STONE 6" X 2" X 1" Fine
10.458 INDIA STONE 8" X 2" X 1" Fine
10.462 INDIA STONE 6" X2" X 1" Medium
10.463 INDIA STONE 8" X 2" X 1" Medium