This is a great invention which I only received today and have used for a short time but am already glad I bought two for different grits and may buy more will. Perfect. I can't say the same of a postman who is too lazy to carry them to the door and tucks the ends of the package into the door of my lockable mailbox so that 2/3 of the package is hanging for all to see. I have a lockable mailbox because people steal mail there. A lot of. The postman knows that. Lazy. Revain shouldn't trust them, USPS is useless to deliver anything but spam. But I love grinders, bring you hand grinders.