SECURELY PROTECTS THE ENGINE PARTS: The compressor can be used to install the piston. You just need to insert the piston ring correctly in the cylinder without distorting or damaging the parts. WIDE APPLICATION: The adjustable ratchet compressor has been designed in such a manner that it can be used most commonly on the automotive piston of car engines having a diameter of 3-1/2 inch to 7 inches. RELIABLE TO USE: The piston ring compressor comes with a ratchet type and with an adjustable safety screw. It makes the tool reliable to use for any commercial vehicle. PREMIUM QUALITY: Constructed from high-grade spring steel material for maximum strength and longevity. The coated surface protects it from corrosion and heat resistance, sturdy and durable for long time use.