Marine Grade Electrical Wire Grommets - 45 Assorted Combo Pack, 1/4" to 3/4". Ancor's Marine Grade Electrical Wire Grommets Combo Pack.. Features:. 45-Pack. Assorted from 1/4" to 3/4". 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.