Insulated Distribution Stud, Single 1/4". Insulated Distribution Stud, Single 1/4" -. Made with high temperature plastic bases. Stud covers push securely over the threaded stud covering to ABYC standards. Dual studs ideal for +ve / -ve connections, branch circuits, windlass or inverter installations. Covers supplied with display versions. WARNING: 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.