D4DS-K5 Omron Safety Door Switch Key

D4DS-K5 Omron Safety Door Switch Key (or Actuator)

• Brand: Omron
• Type: Safety Door Switch Key / Actuator
• Function: Provides a key operation for electromagnetic safety door switches (D4D/D4GL series).
• Application: Industrial automation, machine guarding, access control.
• Other Names: 11018-1005, Z2725, D4DSK5. 

You can find it listed on various electronics supplier websites, where it's described as a flexible key for safety applications.