Drive Sleeve, Type Grounding, Material of Construction Copper Coated Steel, Rod Dia. (In.) 5/8, Description/Special Features Slides on Top of Ground Rod to Prevent Mushrooming, Package Quantity 1 Features - Package Quantity - 1WARNING: California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.California proposition 65 warning