From Jan. 1, 2021 till now, material price have increased more than USD200/ton. From Mar. 15 to Apr. 14, material price increased about USD100/ton. ...

   The difference between fine thread and coarse thread drywall screws is use. Fine thread drywall screws are used for connection between gypsum board and steel board whose thickness is note more than 1.0mm. The coarse thread drywall screws are used for connection between gypsum board and wood board. Coarse thread is fast on wood and will not damage it. ...