high quality nails! The increasing numbers relate directly to the thickness of the screw. As a rough guide, the #8 screw is recommended for general purposes whereas a #6 screw would be better suited to fine woodworkingAbout this itemPhosphate finishedBlack drywall screwIdeal for attaching drywall or wall board to wood studsThin shank, sharp pointWon't tear surface paper of drywall all sizes available. drop me a message for required size if its not on the listing Payment:We accept all kinds of payment ,It is fast, Easy and Safe.PLEASE NOTE: S&H DOES NOT INCLUDE DUTIES, LOCAL TAXES OR ANY OTHER IMPORTATION FEES.Please list your special requests in the NOTES SECTION when you make payment. Shipping:We Ship to Worldwide.Orders processed within 24-48 hours of payment verification. it will take 15-30 days for delivery. but Customs will random inspection some parcel, so that's why some parcel may delay a bit to arrive. Guarantee:Very Good quality. Buy with confidence!If you are not satisfied when you receive your item, please return it within 7 days for a replacement or money back. Please contact me before you return it.Full refund after we receive our original item, Note: Return shipping is to be paid by the Buyer. Our goal is to provide high quality product with competitive price and excellent customer service to our buyers.We will work with you until you are satisfied. We will leave positive feedback as soon as the transaction has been completed.We sincerely hope that you can leave us a positive feedback aswell.Feel free to contact us if you have any question about the products.Please give us the opportunity to resolve any problems. WE WILL SHIP OUT WITHIN 1-2 DAYS AS SOON AS PAYMENT HAS BEEN MADE!!