1. Type A,E,K,L for the junks washover. 2. Type C,F,H, ... the top fish O.D. 3. Type B,D,I,J,F,G,M,N for hard stratum Description:It is ... use type it can be divided into:1. Type A,E,K,L for the junks washover.2. Type C,F,H ... the top fish O.D.3. Type B,D,I,J,F,G,M,N for hard stratum washover or stabilizers ...