Summary: plain cousins Roofing nails have large heads to hold soft asphalt shingles Drywall nails with sightly smaller heads are used to install gypsum wallboard drywall Nail sizes The penny system for sizing nails originated in England The letter d was the designation for the English penny In the early days the same abbreviation was used to indicate a
Image Dimensions: 500 x 347
Image originally found here.