DESCRIPTION: Brand new spark plug thread repair kit Install steel thread inserts in damaged aluminum cylinder heads 18mm I.D. inserts for use with 18mm spark plugs 7/16”, 1/2”, 5/8”, and 13/16” long inserts SHIPPING INFORMATION: Most orders ship within one business day. PAYMENT INFORMATION: Please pay at the time of purchase. FEEDBACK: Positive feedback is given for a positive feedback received. [Item Code: GT812]