Quick view M. 5/8" Ground Rod Adapter ⅝” Ground Rod Adapter Driving a ground rod into the earth can be tough, but we are here to help. This ⅝” Ground Rod Adapter is a female insert, has an ID of .75” and is our standard. Adapter M: 5/8" Ground Rod Adapter This... MSRP: Was: Now: $65.00 Add to Cart Compare