... Tube Grade: ST52,ST52.3,CK45,E355,16Mn,STKM13C,SAE102 Ready to Honed Tube for Honed Tube/Pre-honed Tube/Precison Cold ... ,CK45,E355,16Mn,STKM13C,SAE1020,SAE1026,SAE1045Metric size: 40 to 1000mmInch size: 1.5" to 20"Length: max 15 MeterStraightness: < 0.5 mm ... /mTolerance OD: DIN 2391ID Honing Margin: + 0.3 to 0.6mm.ID Roughness(Ra): < 1.6 Micron Ready to Honed Tube for Honed Tube