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The OEMTOOLS Piston Ring Compressor is self-locking with double-tension band and heavy-duty pawl. It is designed to handle most types of rings in the majority of passenger cars, including those that are channeled and segmented. It has a beaded edge so that the compressor can't enter a cylinder with a piston. The 1/2 inch wide spring bands equalize the tension over the entire belt width so that the spring assembly may be compressed into the groove until it's flush with the piston.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65Warnings.ca.gov^