About this item: [Marine Grade Wire Connectors] - The heat shrink connectors kit includes ring, fork, spade, and heat shrink butt connectors. ( AWG22-18, 16-14, 12-10 for 3 types gauge, 3 colors&8 sizes ) The high-quality wire connectors make work easier.[99.9% Pure Tinned]- High-quality effectively prevents copper layer rust and then cause bad contact,anti oxidation prevent electrical . It provides minimal voltage drop, high current flow and less heat. These will prevent short circuits and and make your connection projects and better.[Durability & Safety]- The polyolefin heat shrink tubing provides the high tensile strength and resistance to stretch and minimize mechanical damage, so there's no worry of rat chewing or similar physical damage issues. The thick tinned copper and seamless barrel design ensures strong and secure crimping all the time with no issues of wire off.[Waterproof & Flame-retardant]- Insulation tubing features a unique dual-walled design. Adhesive lined inside the 3:1 heat shrink connector will exude hot melt adhesive when evenly heated, shrinks quickly and adheres to wire insulation, which 360 degree secure seal and excellent waterproof property. Insulated waterproof marine grade crimp terminals can be used underground.1.0mm for 12-10 AWG0.8mm for 16-14 AWG0.7mm for 22-18 AWGWhether you are working on your boat, vehicle, home or factory, Marine Grade Electrical Connectors Kit will be your .Insulated waterproof terminals can be used underground.For best results, please choose the right connector, use a hot air , heat evenly until connector reduces in size and the adhesive flows, filling gaps within the terminals.Note: due to different production batches, the plastic box style is randomColor: As ShownMaterial:polyolefinPackage Contents:560PCS Marine Grade Heat Shrink Wire ConnectorsOnly 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.