... Certificate:ISO OEM available 316 Stainless Tool Steel Bar(Round,Square,Angle,Flat,Channel,Hex) Specifications 1) Standard : GB ASTM, JIS, etc2 ... , etc2. Grade: ASTM3163. Diameter: 2mm-300mm4. Shape Manufactured: Flat Bar, Square Bar, Round Bar, Hex Bar,Channel Bar and special Shapes ...