This is a key for NIKKANA's "Double-Sided Twist Lock #606". Usage: This lock is mainly used for wooden sliding entrance doors. Features: The lock is engaged and disengaged by inserting the key into the keyhole and twisting it. Manufacturer: Originally manufactured by Nikkana (Nikkana Co., Ltd.), after the company's dissolution, Osaka Kanagu Co., Ltd. took over the molds and continues to manufacture and sell them under the "GUARD" brand. Contents: Usually, three keys are included. Thank you for viewing. I am selling this due to my mother closing her shop. Thank you for your purchase.