The trough type also uses stainless steel pendants to fix the stone panels. The through-slot type means that the panel slotted side should be fully slotted. The stone can be dry-hanged through the back bolts and pendants. Of course, which pendant to use can be purchased or customized according to the welding situation of the keel. Each stone is supported by 4 back bolts. The back bolt mainly uses its unique "internal wedge cut" to mechanically lock the stone.