This Piston Ring Compressor is ideal for the small garage or the individual repair job. The self-locking ratchet piston ring compressor with double tension band and heavy duty pawl 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. 2-band design, 2-1/8-inch to 5-inch range. 3-1/2-inch deep.