Hi Ruth - Thank you for asking about Trex installation. Trex recommends using the Trex Blade or a carbide-tipped blade with 60 teeth or more if you are using a miter saw. The Trex Blade comes in three different sizes and is ideal for cutting all Trex decking and railing products. Please see the [Trex Install Guide](https://www.diyhomecenter.com/media/pdf/trex-installation-guide.pdf) pdf for more details. Best of luck with your railing installation.