The correcting plates’ Proportions are 100 mm x 40 mm. The pole returns sit in the centre with the bracket plates which provides 20mm from the perimeters of bracket plate to pole and screw gap centres. Available with or without having collar. It’s important to know that a “return” usually https://beaulnhw84051.livebloggs.com/37588914/everything-about-inside-mount-curtain-rods