Dental Materials, Dental Lab Materials, Dental Laboratory Equipment manufacturer / supplier in China, offering 1-1/8" Black Phosphate Drywall Screws Coarse Thread Bugle Head Gypsum Screws, Coarse Thread Self Tapping Drywall Screw Gypsum Tornillos Black Screw Drywall Manufacturer, #6 X 1-1/4" Drywall Screws Coarse Thread Sheetrock Wood Screws with Phillips Drive and so on.