Abstract: A structural support apparatus comprises a connection bracket comprising, a generally flat, rigid member having opposing generally flat faces and a thickness extending between the flat faces. The rigid member is attachable to a support member. An arm extends from an end of the rigid member and a finger extends from the arm and is receivable in a hollow channel formed in an attachable member of rigid material. The hollow channel is complementary in configuration to at least one of the finger and the arm and a selected recess configuration is formed between the finger, the arm and the end of the rigid member. The recess accommodates one or more lip portions of the attachable member when either the arm or the finger, are received within the hollow channel.