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This Piston Ring Compressor tool is necessary for the installation of pistons into the cylinder block. The compressor folds around the piston, holding the rings in their grooves and allowing the piston and ring assembly to slide into the bore without damaging the pistons or rings. For pistons 53mm to 125mmAdjustable 53mm to 125mm.For installing pistons into cylinder block.Allows piston and ring assembly to slide into the bore minimizing damage.Key handle allows compressor to be tightened.Time saver.