[Simple as Can Be]Using this solder kit is a cinch. Just heat the wire connectors and shrink tubing with a hot Pros and amateurs alike can do it in a snap.[Color Coded]Never reach for the wrong piece again. The color coding system categorizes each piece by length and diameter, making your job that much easier.[Designed for Durability]The high quality polymer shrinks quickly, provides excellent insulation and is 100% waterproof. Each piece will outlast repeated wear and tear without slipping or tearing.[Endless Possibilities] kit is great for a wide variety of electrical repairs. It's a must for data line protection, automotive, marine and outdoor applications.HOW TO USE:Select the proper size connector for the wires, stripped wires.Insert the stripped wires into the connector.Apply heat evenly to the connector from the 2 ends first until tubing shrinks and the adhesive flows, then continuously apply heat evenly until solder sleeve melt and seal.Note:For best result, please use a hot and rotate the connector to evenly apply heat.Please raise the temperature from low to high gradually when you use the hot to heat the .Please DO NOT set the high temperature at the beginning, or the surface of connector will be over-heated, which will lead to the tube melt while the solder ring still not melt.Keep the hot at the proper distance. Don't get too close.Shrinkage ratio 2:1Minimum shrink temperature: 80CMinimum temperature for solder to melt: 138COperating temperature :-55 - 125Waterproof Class: IP 67Material:Metal + plasticColour:Red, blue, white, yellowPackage Contents:300 * waterproof shrink-wrap ring terminals (50 x red shrink connector AWG: 22-18, 50 x blue shrink connectorAWG: 16-14, 40 x white shrink connector AWG: 26-24, 10x yellow shrink connection AWG: 12-10)2 * plastic boxOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.