1.PIPE MARKING TOOL '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 2.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 3.ACCURATE PLACEMENT The center finder has a 4 inch Y-type head that conforms to pipe curvature 4.BEST OPERATION Use this manual hardened centering pin angle finder with a small hammer or mallet to tap the pin in for the most effective pipe marking Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin