[Economic Measuring Tool] This pipe marking centering tool is effective for setting centerlines, determining angles and marks for butt joints, locating points inside pipes or tanks, aligning keyways, and calculating slopes. It is suitable for pipes or tanks with a minimum diameter of 1/2 inch. [Durable and Sturdy Material] This pipe center finder wraps around the pipe circumference for measuring and marking. It is made of highly flexible, heat-resistant gasket material. It is easy to use and ideal for pipe fitters and welders. [Y-shaped Base with DSL] This tube center finder features a 4-inch Y-shaped base with an adjustable dial bubble protractor (DSL). The center post can be pressed down to the anchor point as needed. [Adjustable Dial Bubble Protractor] Includes inch scale, inch chart, and leveling indicator. The green liquid bubble must be centered between the two lines on the protractor to confirm level. This tool helps draw straight lines around pipes. Easy to Operate: Step 1. Loosen or tighten the hex nut using the included hex wrench. Step 2. Place the tool on the pipe and adjust to the desired angle. Step 3. Press the center column down to the fixed point position. Step 4. Tap gently with a hammer to mark the fixed point on the pipe. Material: Metal Color: As shown Package Contents: 1 x angle finder Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.