Antique Door Knob 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, tasteful appearance. The square spindle is 7mm thick. The length is approximately 90mm. Adjustment is possible with 6 holes, but the innermost holes did not go all the way in, so processing is required. Thank you.