The look of wood… The durability of precast concrete… Introducing DesignCast® Precast Rail Fencing DesignCast® Precast Rail Fencing is an ideal choice when a project requires the look of wood rail fencing and maintenance and longevity are a factor. This sturdy alternative features integral color, available in both standard and custom colors. 2 rail, 3 rail and 4 rail systems are available in both 8 ft. and 10 ft. post spacing. Investing in this system provides a long lasting alternative to conventional wood fencing.