• M14-1.25 thread inserts
• Use with drill bit size 9/16 in. (14.5 mm)
• Includes: (6) 503 Stainless steel inserts
• Lengths: 5/16, 7/16, and 5/8 in.
• Designed for use with tapered or gasket seated spark plugs
• Recommended to use with W86910 thread repair kit for proper tap and insert tools