The rebate of a frame is the inner cut out ‘lip’ in which the glass/acrylic, artwork and backing board are held into the frame by. Without it, the artwork would fall through! Most frames have a rebate between 7mm to 15mm and each print has been designed with that in mind:5" x 7" - 8mm border8" x 10" – 11mm border10" x 12" – 12mm border11" x 14"/12" x 16"/16" x 20"/20" x 24" – 15mm border