The Racers Edge Magnetic Body Hole Mounting Kit is the easy and accurate solution to getting your body mount holes just right. First, simply attach the base to your RC vehicle's body posts with a body clip. Then, put the body on top of the base and center it to the vehicle. Lasty, hold the marking magnet over the body near the base, and it will snap to the base. Now you can mark your body in the exact spot you need to ream! Includes: Post Base x4, Magnetic Marker x4, Case