Stainless Steel Ball SS440C, SS420, SS316L/316, SS304 Stainless Steel Ball Features: 1) Materials: SS440C, SS 420, SS316, SS 304 2) Grades: G100 ~ G1000 3) Complies with the China GB308-2002 and ABMA Std. 10A-2001, JIS, DIN 4) Applied in all kinds of exactitude machines, hardware, bearings, wheel, caster, slider, bicycles and trust bearing pulleys