Gimbal MountsSimply slide the mount&';s gimbal tube into your boat&';s recessed holder. Once in place, you have a base ready to accept your downrigger. No holes to drill or changes to make on your boat. Removes easily by pulling up and out of rod holder.12" Gimbal MountWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.