Cast brass knobs done in an antique finish. BK-142D's overall measurements are 1 3/8" in diameter with a 1 1/8" projection. BK-104D's overall measurements are 1 9/16" in diameter with a 1 1/8" projection. In our antiquing process, each item is treated with a chemical process that 'ages' the brass giving the pieces the rich patina seen on antiques. Each piece is done by hand and all of the items from your order are done at the same time to ensure that all of your pieces have the same finish. Antiquing may delay shipping by two to three days. Please note that the actual color of the antiqued item may differ slightly from the above picture due to variations with computer monitors.