Usage Tips:[Economic Measuring Tool]This pipe marking centering tool is very effective and useful for setting centerlines, determining angles and marks for butt joints, and locating points within pipes or tanks, arranging keyways, and calculating slopes. It can measure tanks or pipes that are at least 1/2inch in diameter or larger. [Durable and Sturdy Material]The pipe installation tool can be wrapped around the circumference of the pipe for measuring and marking, it is made of highly flexible, heat-resistant gasket material. This pipe center finder tool is easy to use and is a must-have for pipe fitters and welders. [Y-shaped base with DSL]This safety tube center finder has a 4-inch Y-shaped base with an adjustable dial bubble protractor (DSL). You can push the center post down to the anchor point as needed. It's a must-have in your list of pipe welding tools. [Adjustable Dial Bubble Protractor] with inch scale, inch chart and chart, this pipe installation tool can help you draw straight lines around pipes. To judge level, the bubble of the green liquid needs to be halfway between the two lines on the protractor. Easy to Operate: Step 1. Loosen or tighten the hex nut with the included hex wrench. . Place the pipe marking tool on the pipe and find the desired angle. Step3. Push the center column down to the fixed point position. Step4. Tap with a hammer to leave a fixed point mark on the pipe. Material: Metal colour: As shown Package Contents: 1 x angle finder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.