Solder ring terminal: SST-R11 white:Suit Cable / Wire Size 26-24 AWG,0.25-0.34mm2 SST-R21 red:Suit Cable / Wire Size 22-16 AWG,0.5-1.5mm2 SST-R31 blue:Suit Cable / Wire Size 16-12 AWG,1.5-2.5mm2 SST-R41 yellow:Suit Cable / Wire Size 12-10 AWG,4.0mm2 The product is the latest solder ring connector. The product only needs to be connected by heating, which is convenient and quick, and the connection is firm and waterproof. Heat shrinkable terminal: RV,SV,FDD,MDD,BTH The product is the latest heat shrinkable connector.After the terminals are crimped, the terminals can be tightly connected by heating to achieve a waterproof connection.