The OTC Piston Ring Compressor, No. 5852, is designed to assure proper piston installation while reducing the possibility of broken rings. The ring compressor has a diameter of 4.589" and works on select Navistar MaxxForce, N9, N10, and 9000 engines. The product dimensions are 13.4" width by 10.6" depth by 7.5" height, and it weighs 8.9lbs. The ring compressor is made in the U.S.A.