Note: The pilot drill bit is made of 6542 steel,making this pilot drill is very hard and brittle. Please keep the drill straight and do not twist or swing sideways. ProductSiteLaunchDate : 2016-10-04T03:05:09.806Z Size : 6/8/10mm+4/5" diamond chamfer bit Style : Compact SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SurfaceRecommendation1 : Stone SurfaceRecommendation2 : Tile SurfaceRecommendation3 : Cer SurfaceRecommendation4 : Masonry UnitCount : 4 UnspscCode : 27111700