PBC Linear NIM04 0300 SL Linear Shaft, Solid, 4 mm Dia, 300 mm Lg, Carbon Steel, Polished 49101942 9 ohm Insulation Limit Alarm 9 ohm Insulation Limit Alarm No Operating Voltage 12V Maximum AC Voltage Measured 750 V Data Logger Yes Maximum Capacitance Measured Not Applicable Minimum AC Voltage Measured 30 V Maximum AC Current Measured Not Applicable so they're good for striking plastic Linear Shaft Lined Bearings Finish Polished Shaft Material Carbon Steel System of Measurement Metric Standards ISO Shaft Material Finish Polished Shaft Hardness RC 60 Product Type Linear Shaft Shaft Drilling Undrilled Shaft Material Grade 1060 Surface Roughness 8 12 RMS Series NIM Roughness 8 12 uin RMS Weight Per Meter 0