These are likely vintage Premier drum wing bolts manufactured between the 1960s and 1980s. They were used as securing bolts for parts such as tom brackets, bass drum brackets, and stands. I purchased these on eBay previously and kept them stored in a fiber case. The bolt standard appears to be imperial, as an M8 nut did not fit. Unfortunately, I do not plan to sell them individually. Thank you for your consideration, understanding that these are vintage items that have been stored long-term in a warehouse.