I get the bolts from China. For sizes , go measure yourself or just read the mod bible.In details , I get my bolts on Song Hu Road , 5 minutes drive from SMP Skatepark in Shanghai , China. It is a few shops down from 4BDN skateshop. There is no harm for me to tell you all these because like I have said , I make no profit if not low profit and I'm selling the bolts for $2 so how much profit do you think I can make? So , now , those who think my stuff are expensive or something , go buy the bolts yourself.