Questions about Fi-Shock® Yellow Nail-on 5 Inch Extender Insulator with Barn Nails

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Q.regarding the 5 inch insulators that extend from posts how long are the nails. I want to know how far you drive the nail into post. I will be using 4 inch posts.. (i.e 2inchs >) Have had problems in the past with nails working loose
A.

The included nails are four inches long.

Q.How far into post does nail extendsand are nails included
A.

The included nails will extend approximately 1 inch into the post.