Upvc open window lock

[ZXSpectrum]

Does anyone know if there is a ancillary lock I can get that I can lock the window in an open position more than the small crack on the second position while closed.

 

[thezappa]

Window restrictors. Cheaper elsewhere but these will let the window open to 100mm (or should do)

https://www.amazon.co.uk/dp/B008MJOF8O/ref=cm_sw_r_sms_c_api_TPAYybH2WVG9Z

 

[ZXSpectrum]

Perfect, thanks matey