Natural stone balck slate tile 1. low price, high quality 2. thickness: 12cm--20cm 3. delivery time: within 15 days. natural slate,natrual stone,slate ... : 300*300mm,450*450mm,600*600mm3) Processing Finish:Natural Splited,sawn,honed and polished finish are available.Roofing slate specification:1) Thickness ... :200*200mm,320*220mm,400*200mm,400*250mm,500*250mm Natural stone black slate tile