1. 150° Grooved Design: The 150° V grooved base allows for easy fixation of the dial indicators on both cylindrical and flat surfaces. 2. Size: Fixed arm height: 6.7'; Extension arm length: 5.7'; Magnetic Base dimension: 2.36'(L)x 1.96' (W) x 2.17' (H); Holding Power: 176lbs/80kg. 3. Universal Knob: The flexible, strong, and precise rotary joint enables adjustment of the support rod in any direction and secure fixation. Featuring a spring loaded fine adjustment on the top arm. 4. On/Off Switch for Magnet: The magnetic base is equipped with an on/off switch to release the magnet's force, allowing for easy movement without magnetic influence. 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-YJL official store