Fangrui Product Details [excellent Function]: The Pipe Center Finder Is Designed To Assist Users In Accurately Locating The Center Of A Pipe Or Cylindrical Object. This Utilizes A Combination Of Visual Cues And Measurements To Determine The Precise Center Point Of The Pipe, Aiding In Tasks Such As Drilling, Welding, Or Installing Fixtures Onto The Pipe. [wide Application]: Our Is Used To Measure Pipes From 1-1/2inch To 6inch In Diameter: It Can Be Used To Set Center Lines, Determine Angles And Marks For Butt-ins, And Locate Points Inside Pipes Or Tanks, Line Up Keyways, And Calculate Inclinations. For Pipefitters And Welders, It Makes Positioning Work More Efficient And Saves You Time And Effort. [easy To Use]: 1. Adjust The Hexagonal Nut With The Included Screwdriver. 2. Place The Pipe Marking Center Tool On The Pipe And Move To Get The Angle You Want. (when The Dial Is Set And Positioned In The Center Of The Green Indicator, The Green Indicator Must Be Level) 3. Push The Center Column Down To The Fixed Point P