Product Description 10pc Master Piston Ring Service Tool Kit PT51101 Expands & Compresses Piston Rings & De-Carbonizes Ring Grooves Features A must for the professional mechanic Three ratcheting, spring steel & self-locking ring compressorswith quick release button Spring steel construction gives a positive & even compression & the self-locking ratchet pawl prevents accidental release with quick release button Three ratcheting, spring steel & self-locking ring compressorswith quick release button The spring-loaded piston ring expander has a smooth gripping edge to prevent damage or breakage to the piston ring & has a soft a comfort grip handle Piston ring groove cleaner makes short work of carbon build-up & comes with three rotating Metric & SAE cleaning blade tools Offset Phillips & Blade screwdriver & Hex key