Centered V-Magnet ~ 2 X 2 X 2-1/2″ ~ Grip works on round or flat surfaces. ~ Post mount thread is M8 X 1.25. ~ Bottom and back both have magnetic mounting surfaces. ~ On/off switch. 2 x 2 x 2-1/2″ Grip works on round or flat surfaces. Post mount thread is M8 X 1.25. 170 lbs. of power pull. Bottom and back both have magnetic mounting surfaces.