These nail headers are based off of 18th century nail header designs, and do their job well. The tall dome makes it easier to get in the steeply-angled hammer blows needed to finish a traditional faceted nail head. Period common nails often had shanks with a rectangular cross-section, so for making period common nails in the 6d to 10d size range the 1/8”x3/16” hole size is recommended, though the 3/16” square hole is a good solid choice for those sizes as well, and I do not recommend a larger header for average-sized nails. The recommended stock size for use with those headers would be 1/4”. The 1/8” hole size is for very small nails, while the 1/4” hole size would be best for heavy nails between 4” and 6” long, and will require the use of 5/16” or 3/8” stock. Body of nail header is mild steel, dome is hardened and tempered high-carbon steel. Overall length is about 9”. Headers are made to order- please allow up to 60 days turnaround time.