3/8 to 2-1/4" 6 Piece Adjustable Parallel Set Made of precision ground tool steel. Minimum Measuring Range (Inch): 3/8 Maximum Measuring Range: 2-1/4 Length Range From : 1-3/4" to 5" Height Range: 3/8" to 1/2", 1/2" to 11/16", 11/16" to 15/16", 15/16" to 1-5/16", 1-5/16" to 1-3/4", 1-3/4" to 2-1/4"Easily expanded to size in openings for quick reference measurements. Lock desired size by using the set screws that are provided with the set. Quickly Adjustable And Locked With Screws For Micrometer Furnished in fitted plastic case that has size range markings on it. Applications for layout, inspection, shop work, set-up, etc. Shipping Weight: 2.2 lbs