... colordurable2.Regular size:400*200,400*250,300*300mmRegular thickness: 8-10mm3.Slate application: roof repair, roof maintaining ... In accordance with our Inspection Regulations, which cover color, size thickness tolerance,workmanship, surface treatment, packing way, crate, gaps, ... , honed, brushed, edge machine cut or bull nose4. Slate Slab:thickness—20-35mm / size—1000*1000, 1000*1500, 1000*2000 ...