Up for sale are 10 sets of Magerack 4" Standoff for Solar Panel Module PV Mounting Racking that can be used for solar installation. Standoff is made of aluminum alloy 6061-T6. The bolt to attach L bracket or other attachment is 5/16" bolt with lock washer or flange bolt.  

The post is 4" tall from bottom. 

The products carry 25-year manufacturer warranty. The quality of this item is guaranteed. You may return it within 30 days if you are not satisfied.