CTA Tools 2450 Plastigage, 2-Piece Measures Clearances of the Engine Rod and Main Bearings on All Auto Engines Gauge Conveniently Printed on Envelopes Makes Using Expensive Micrometers Unnecessary - Choose the Proper Size of Replacement Bearing Inserts Set Features 2 Sizes: 0.001-Inch to 0.003-Inch and 0.002-Inch - 0.006-Inch (0.025 - 0.08-Millimeter and 0.05 - 0.15-Millimeter) Heavy-Duty Construction Allows for Strength and Durability