ASTM A519 Seamless carbon and allou steel mechanical tubing For mechanical engineering Size: OD: 4.0-114mm WT: 0.5-15mm Steel Grade: 1008, 1010, 1018, 1020, 1025, 1026, 4130, 4140 Richard Shen Ningbo New-Era Steel Tube Co,.Ltd Tel: 0086-574-87334900 Fax: 0086-574-87715158 Mobile: 0086-(0)137 3616 4628 Email: Richard831228@gmail.com Msn: Richard831228@hotmail.com Skype ID: Richard831228