This 54 piece set is a great starter set, provides 2 each of the most common switches in RVs, and is great for service centers and service trucks. Contains 2 each of the following: B1-10-315G, B1-52-315G, B1-18-315S, B1-80-315G, B2-56, B2-18, ZU-12-14, ZU-06-14, ZU-03-14, ZU-09-14, S2-67, G2-11, A1-10, ZU-02-14, A1-31, A1-82, P2-61, A6-23, P7101, P7115, P7118, P7158, E2-41, A2-38, HRB1, HRB2, and HRB3.