Wire thread inserts | V-COIL Thread Repair System- Coil holder wire ,Wire thread inserts Manufactured from high quality chromium nickel stainless steel, V-Coil inserts provide high strength internal threads that resist the effects of temperature and corrosion. Their unique design ensures superior threads whose compound performance cannot be reproduced by any other single fastening method.Buy Ignition Coil Wire at Advance Auto PartsWhat is a Core Charge ? A "Core Charge" is similar to the deposit you might pay for a can or bottle of soda. In many states, to promote recycling, you are charged a deposit when you purchase a can of soda and you receive your deposit back when you return the empty can.