●Enables the installation of piston rings ranging from 73mm to 111mm. ●The easy to use ratchet mechanism allows the user to compress the piston rings in small increments. ●Includes: 1 ratcheting piston ring compressor pliers and 6 ring compressors (73-79mm,79-86mm,86-92mm,92-98mm, 98-105mm and 105-111mm).