NB 25mm refers to the width of the venetian blind slat, not the size of the top rail or bracket.
One pair (Two) end fix box brackets for venetian blinds
for headrail measuring up to 25mm x 24mm
external dimensions of brackets - max 36mm x 34mm x 25mm
internal dimensions of brackets - max 31mm x 24mm x 22mm
slide in fixing plate
clear plastic
THESE END FIX BOX BRACKETS CAN BE TOP,FACE AND SIDE FITTED.
FIXING SCREWS ARE NOT SUPPLIED