This pickguard is installed by attaching three small brackets to three banjo hooks. Under the pick guard, there are two thin metal rods that go through the holes in the brackets that attach to the banjo hooks. This photo shows one of the bracket/hook units. This banjo is thought to be a 1930s era Slingerland. The Slingerland Musical Instrument Mfg. Co. was based in Chicago, Illinois and was owned and operated by H.H. Slingerland. The company changed names several times, including The Slingerland Banjo Company, Slingerland Banjo and Drum Company and others.