When it came down to designing the GR3, the ability to extend the rack and turn it into a 6-post was crucial. Like the base power rack, these components are made of 11-gauge steel with 1″ hardware. The rack extension allows you to utilize space effectively and easily load and unload your barbell. An added benefit of a rack extension with weight storage is that it adds more security to your rack, preventing tipping when loaded up with plates.