Protect your spark plug wires from engine heat with this kit. It includes eight 6-inch long fiberglass sleeve covers that slide over your existing spark plug boots (they fit 90-degree, 45-degree, or straight boots). These sleeves can handle temps up to 1200°F. The kit also comes with 12 wire separators (4 long ones with 4 holes, 8 short ones with 2 holes) and an Allen key to install them. The separators help organize and route your spark plug wires neatly, keeping them away from hot exhaust manifolds and making your engine bay look cleaner. Fits wires sized 8mm, 9mm, or 10mm. Note: For gasoline engines only. A simple upgrade for better engine bay organization and protection.