This is a set of 4 bags of Tanaka products. There is nothing written on the 4 bags, so please be sure to check the photos before purchasing. These were kept at my parents' house, so I don't know what they are used for. The 4 bags have hexagonal heads. Length: about 7 cm Approximately 50 pieces per bag x 4 bags This is an estimate as I haven't counted them one by one. They are old, so the bags are torn and dirty, but the screws don't seem to have any rust.