G200 3.17mm 3.5mm 4mm 4.5mm 4.76mm 6.35mm 6.8mm Solid Steel Ball Guangzhou Decok Steel Ball Co., Ltd. Base Info Description Pre：12mm Chrome Steel Ball Bearing Ball 6.35mm 50.8mm 25.4mm 12mm G10-Grade Next：AISI201 304 316 440c Stainless Steel Ball Hollow Sphere 50mm 200mm 300mm
