This is for 1 x new metal clockwork motor keys

 To fit an output shaft of 1.98 mm diameter. Square peg

These were made by a company called TTS for educational purposes. We used to sell them with the motors, but can no loger get these.

I can't tell you if these will fit certain toys as I am not an expert, so please measure the diameter of the output shaft.

Free postage to UK mainland