K-Tool Spark Plug Gap Tool

This is a Spark Plug Gap Tool made by the K-Tool Corp., Wixoma, Mich.
The front is measured in inches, reverse side in millimeters. The numerals along the edge coincide with the thickness of the disc at the given point. The hole is used for adjusting the electrode. - Aluminum / # KTI-73701
** K-Tool was founded in 1981 by Ed Kay and now designs, develops and manufactures over 3,000 hand tools, specialty tools and accessory items, as well as related specialty equipment. Serving the professional mechanic through distribution since 1984, KTI sells strictly through distributors located across the U.S., Canada and Puerto Rico. - Circa 1980's (original logo, new company logo is K-Tool International)