Do you have product that is squared on one side and grooved for hidden fastener on the other side.

Hello, and thank you for your interest in Trex. Trex offers a square edge deck board, and a grooved edge deck board option within all of the decking lines. To obtain a board with one square edge side, and one grooved edge side Trex recommends ordering a square edge deck board and the Trex Router Bit to route a groove on one side of the square edge deck board when needed. I hope this helps! Thanks, Tori - Trex Customer Care Team