花岗岩石材坚硬，内部结构致密，硬度大，抗候性很强，在室外可存放长久且保持外观不变色的一种材质。我国的栏杆一般都使用在室外，室外的环境相对恶劣，需要能经受得住风吹雨打。
Granite material is hard, compact, hardness and weatherproof. It can be stored outdoors for a long time and keep its appearance unchanged. Our country's railings are generally used outdoors, outdoor environment is relatively bad, need to be able to withstand the wind and rain.
大理石与花岗岩一样，同属于天然石材系列。但是大理石相对来说形成的方式与花岗岩不一样，在更表层一些，其外观花纹太多，一般适合做室内的石材栏杆。而颗粒状的深层花岗岩则就相当合适做为适室外栏杆的用材。
Marble, like granite, belongs to the natural stone series. But marble is formed in a relatively different way from granite. In the more superficial layers, there are too many patterns on its appearance, which is generally suitable for making indoor stone railings. Granular deep granite is suitable for outdoor railings