It’s every mechanic’s worst nightmare - a cross-threaded spark plug hole or oxygen sensor bore. Now there’s a better way to fix the problem – the Back -Tap™18mm thread cutting and restoring tool from Powerbuilt Tools.

The Back-Tap's patented collapsible design allows it to be placed all the way through the bore or spark plug hole. A mandrel is then drawn back, expanding the tool's threaded area and threading into the clean threads at the bottom of the bore. The Back-Tap repairs the damaged threads as it is drawn up through the bore, bringing debris and metal filings with it. Voila! A cleanly threaded bore immediately followed by a sigh of relief! The backtap is constructed of premium materials and Made in the USA.

Powerbuilt Tools are Serious Tools for Serious Work. Millions of Powerbuilt products are used every day around the globe, on the job, at home and in the garage. Powerbuilt tools are built with the performance, features, fit and finish to satisfy the most demanding users. No matter which Powerbuilt tool you select, you will enjoy the added confidence of knowing that all Powerbuilt tools and equipment meet or exceed applicable standards set by the US Government and American National Standards Institute (ANSI). Ready to get serious? Get Powerbuilt tools!

--Patented expanding design cuts new spark plug and oxygen sensor bore threads from the inside out

--Collapsed tool passes through hole, then expands to cut threads and extract shavings

--Can prevent cylinder head removal and tapping

--Works on 18mm spark plug holes and oxygen sensor bores

--Meets or exceeds ANSI standards