GOODSON PLASTIGAGE Bearing Clearance Measuring Tool Kit - 10 Piece Assortment (5 Green, 3 Red, 2 Blue) | Precision Engine Measurement for Automotive, Marine & Industrial Applications

For those readers unfamiliar with Plastigage, it is a strand of plastic that deforms when compressed, by tightening the bolts (e.g. main bearing caps), between a bearing journal and the bearing shell proper. One compares the width of said deformed strand to a gauge mark on the product wrapper to read bearing clearance. Nifty idea and simple to use. This item includes ten packages, each containing a foot of Plastigage, of the following sizes:Five No. PG-1 ("Green"),Three No. PR-1 ("Red"), andTwo No. PB-1 ("Blue").The numbers are the Perfect Circle numbers. Each color is for measuring a different clearance range: 1-3 thou, 2-6 thou, and 4-9 thousanths of an inch, respectively. With more of the product for the smaller clearances, which are more common, this assortment gives me enough to last a long time.I believe that this "tool" is the easiest way to measure bearing clearances.