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Protection Description: Helps prevent burns, hardening and cracking of boots. Improves engine performance, extends the life of the wire and sockets. Spark plug thermal protector for both the ignition and the wire, can protect the performance of your expensive plug wire set and increase their service life by using SBC BBC 350 454. Durable material: the spark plug boots are made from two layers of fiberglass. It has good high temperature resistance and anti-corrosion effect, and the thermal insulation temperature can reach 1200 degrees. Compatibility: length 15.5 cm, inner diameter 35 mm, works with straight heated socks at 90 degrees, 45 degrees. Professional Installation: No instruction is included. Simply slide the large end (with the sewn seams) over the boot. Then gently slide the ringed end onto the trunk that connects to the spark plug. The other end is covered with a metal circle for easy installation. Package contents: 8 pieces. Wear gloves and long-sleeved clothing before installation to prevent fiberglass from falling on your body.