The Stonehaven countertop post support is perfect for creating a work surface, reception counter, serving bar, etc. The top plate is 7" long to support up to a 15" deep counter. Each Post support can hold an astounding 300 pounds, allowing you to safely mount thick granite, quartz, marble, other natural stones, and concrete countertops. The Stonehaven Post support should be spaced no more than 30" apart and comes finished in brushed stainless steel.