PIPE MARKING TOOL – Jackson Safety's Pipe Marker is an easy-to-use marking tool designed for pipe fitters and welders as an economical measuring tool for setting center lines, establishing angles and marks for butt-ins, locating points inside pipes and tanks, laying out keyways, and measuring declivity STANDARD SIZE – This Curv-O-Mark Standard #6 model tool may be used on pipes and tanks that measure 1/2 inch in diameter or larger ACCURATE PLACEMENT – The center finder has a 4 inch Y-type head that conforms to pipe curvature BEST OPERATION – Use this manual Jackson Safety hardened centering pin angle finder with a small hammer or mallet to tap the pin in for the most effective pipe marking BUILT-IN PROTRACTOR - Fitted with an adjustable dial bubble protractor (DSL) that reads in 2.5 degree increments