Each package contains six brass door knobs for one-inch (1:12) scale dollhouses or miniature room settings. Six knobs allows you to outfit three doors on both sides or one side of six doors. Doorknobs feature a round backplate. Simple installation. Just use a quick setting glue such as Magna-Tac or Multi-Grip for a strong hold. It is advisable to install the door knobs before installing the doors so that you can allow the glue to dry as the door lies flat. If installing doors already in place, you made need to hold (or tape) the knob until the glue is partially set. Each knob is about 1/4" in diameter.