AISI-E-52100 (Bearing Material), Stainless Steel grades AISI-420, AISI-420B, AISI-420C, AISI-430, AISI-440C, AISI-302, AISI-304, AISI-316 & Tool Steel ( Rock Bit ) AISI-S2. Steel Balls are produced in Quality grade ranging from Gr.5 to Gr.1000 conforming to ABMA-10 A and international standard like ISO, JIS & DIN. depending on customers requirement.