Grade 10 Steel balls
Grade 10 440c Stainless Steel balls
Grade 5 Si3N4 Ceramic balls
1/8 (3.175mm)
5/32 (3.968mm)
3/16 (4.762mm)
7/32 (5.556mm)
1/4 (6.35mm)
Packs of 50,100 or 250
The grade refers to how precisely round the balls are and the grading system is rated from most precise (3) to least precise (2000) an goes 3, 5, 10, 25, 50, 100, 200, 500, 1000, 2000. So as you can see grade 5 balls are very precise.
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