HFS (R) Magnetic Base Adjustable Metal Test Indicator Holder Digital Level - Tool Stand Total Height: Approx. 200cm / 7.8 inch Permanent magnet operation with ON/OFF control Clamping Hole Diameter: Approx. 8mm lexible, strong, and precise rotary joints,can adjust any direction and location With high stability, it will be your ideal tool in the measurement of precision work-piece field.