021920- Chicago Screw adapters allow the concho with to be turned into a wood screw application. Here is a suggestion for using this type of product. I suggest that you screw in a proper wood screw into the hole you intend to use, prior to inserting the adapter. It will ensure that you get the concho down tight and secure without messing up the threads on the shank of the adapter. The brass colored screw posts are what is for sale here, and they are sold individually. Total length of adapter is 1 1/4" length.