Adding this to the AGS (Auto Grip System) used in Hercules guitar stands and guitar hangers allows it to accommodate instruments with narrower nuts and fingerboards. (Compatible with the PLUS series) Also, I think it can be used for ukuleles and guitaleles. Due to the low price, please forgive the simple packaging of just an envelope. ====== Depending on the time of purchase, it may take longer than the specified number of days to ship, so please understand this before purchasing. If you are in a hurry, please contact us in advance via comment, and we can tell you the earliest shipping date.