Lisle Deep Hole Alum Head M14X 1.25 Spark Plug Hole

Features & Benefits:

• Replaces stripped spark plug threads in aluminum heads with 14mm spark plugs
• Installs a new solid steel spark plug thread insert in original thread location
• Set includes one-piece drill tap, long tap holder, short tap holder, insert installer, swedger and handle
• Includes four insert sizes: 5/16", 7/16", 11/16" and 1" (new size).