Big Kid Blocks Body Gapping Tool - Steel is the perfect tool to help create those high end show car gaps.  It is an American machined 3/16" stock.  One end has a "J" to scribe the panel so you know exactly where to cut/sand.  The other end is machined at a 45 degree that can be used as a scribe. It also has one full flat edge to assist with checking your panel match. 

Made from 4140 pre heat treated steel with Rockwell hardness of RC 28-32.