... -6mm (12"x8") 2.lowest breakage rate 3.conform with ASTM406 & B.S.EN12326 standards slate roof tilesNatural slate ... .3T/crate. popular pre-punched position test certificater of conform with standard of EN12326SHOS Processing Common Standards:1.Length and Width tolerance ... : black, blackrusty,yellow,tan, rusty, grey,green and so on;4)Surface Finish: split natural, honed surface; bottom side calibrated ...