This is a very useful and handy tool which allows you to check the thread of most popular wheel nuts and bolts. Thread size is stamped on to the side of each part.

Simply screw the thread checker on to the nut or bolt and this will then inform you what thread each nut and bolt is.

Thread Size	Nut	Bolt
M12 x 1.25
M12 x 1.5
M12 x 1.75
M14 x 1.5
M14 x 2.0
7/16"
9/16"
1/2"