Thank you for choosing from our many products. This is a non-sale, brand new, unused 12-bit screwdriver set. By changing the bits (tips), you can handle various sizes. A magnet is built-in for bit fixation, so it's easy to change by simply inserting it into the cylinder at the tip of the grip. For details, please see the 4th photo. Case size: Approximately 15.5 x 7 x 2.5 cm Although it is brand new and unused, it has been stored at home, so please purchase with your understanding. Color... Blue