These handles all have a 7mm square spindle protruding from the underside of the handle (the spindle goes inside the window) and a nose that closes onto a separate wedge block on the window.
Replacing a handle:
Take the handle off the window by its fixing screws and check the screw positions.
Measure the length of the spindle as shown here:
Measure the step height from the underside of the nose of the handle as shown here:
These can be difficult window handles to replace unless you get the exact type so some element of DIY may be needed.
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