... semi-circular steel balls, welded steel ball, ball grid, stainless steel Large drum (drum) Large stainless steel processing. Materials: 304 stainless steel, 201 stainless steel, 301 stainless steel ... semi-circular steel balls, welded steel ball, ball grid, stainless steel Large drum (drum) Large stainless steel processing. Materials: 304 stainless steel, 201 stainless steel, 301 stainless steel ...