Can I buy a T bill at a bank?

Excuse me, I'm considering diversifying my investment portfolio and have come across Treasury Bills, or T-bills, as a potential option. Given my current financial situation, I'm wondering if I can simply purchase a T-bill directly from a bank. Would you be able to clarify the process of purchasing T-bills at a bank, or if there are any specific requirements or qualifications I need to meet in order to do so? I'd also appreciate any insight into the benefits or potential risks of investing in T-bills as compared to other investment options. Thank you for your time and assistance.