Antique Doorknob Set Ceramic, White I purchased several of these and kept them in storage when I made a handmade door. They are old, but the discoloration of the ceramic and the rust on the brass give them a wonderful, charming look. The square spindle is 7.1mm thick. The length is approximately 90mm. Adjustment is possible with 5 holes. There are cracks in the glaze on the back of the handles. Thank you.