Honed Tube/Hydraulic Cylinder Honed Tube/Burnished Tube Grade: ST52,ST52.3,CK45,E355,16Mn,STKM13C,SAE1020 Honed Tube/Hydraulic Cylinder Honed Tube/Burnished Tube Grade: ST 52,ST52 ... precision cold drawn,seamless honed,burnished High precision cold drawn tube(ready to honed tube) can also be supplied. Honed ...