... ),4.2mm(#8),4.8mm(#10) Length: 25mm,35mm,50mm etc....Coating: Black Phosphated,Grey Phosphated,Zinc,Yellow Zinc,Packing: Rugular ... Phosphated, Zinc Plated, Decromet, Ruspert,Screw Guns Types: Hilti, Makita, etc This is Just an brief introduction to our product: Drywall ... ,CHINA Factory located: Shandong,CHINA... Screws for partition, gypsum ceiling etc...