Description: Unique Design: The Valve Spring Compressor XC4022 features a special bow shaped structure, primarily used for the disassembly and assembly of valve spring.Versatile Use: The Valve Spring Removal Tool comes with five dedicated fittings for valve disassembly and assembly. Please select the correct fitting before use to ensure optimal performance.Easy to Use: Adjust the screw distance based on the width of the cylinder head, rotate the screw inward to press against the end of the valve, compressing it after removing car parts in opposite order.Material: Made from metal, this Car Valve Spring Clamp Compressor is sturdy. Apply lubricating oil before and after use to maintain its longevity.Dimensions: The compression rod measures 2.85inch, 4.61inch, and 4.72inch respectively while inner diameters are as follows - 3 at 0.93inch, 4 at 0.77inch, 5 at 0.63inch, 6 at 0.55inch and 7 at 0.46inch respectively; all included in a set of disassembly tools. Specification: Compression Rod 7.25cm/2.85inch, 11.7cm/4.61inch, and 12cm/4.72inchInner Diameters: 3 at 2.35cm/0.93inch, 4 1.95cm/0.77inch, 5 1.61cm/0.63inch, 6 1.39cm/0.55inch, 7 1.16cm/0.46inch Package Includes: 1 Set Valve Spring Compressors Note: Please allow slightly errors 1-2cm differences due to manual measurement.