... large holes 2) Customized sizes accepted. Large Hole Basalt ,Lava Basalt, Lava Stone, Grey basalt, Volcanic stone,Size 30x30, 30x60, 40x60,50x50,. 60x60 ... , simplicity, classicalism.We can supply various kinds of finished volcanic stones with differently treated surfaces, such as honed, polished, bush hammered ...