Curv O Mark Pipe and Tool Marking Standard Markers Calibration Station Cylinder Holders Alert anyone entering that work Alert anyone entering that work area requires the use of proper PPE Material – The design of these jackets is inspired by bomber jackets and feature a 300D PU coated oxford polyester material with polyester filling The protractor is calibrated on both sides one in degrees and one in rise inches per foot Jackson® Safety Curve O Mark® Pipe Marking Tools are used by pipe fitters and welders alike for an economical precision tool used to mark straight lines around pipes or to mark a straight edge prior to welding or cutting