The measurements below explain the sizes and indicate the dimensions when retracted and extended.
A = retracted
B = extended
Size 180 = (A)140 – (B)180 mm
Size 245 = (A)230 – (B)370 mm
Size 275 = (A)260 – (B)430 mm
CC screw hole window part: 24 mm
CC screw hole frame part: 34 mm