Product Description 7pc Piston Ring Compressor Set PT51102 Ratcheting plier design with 6 ring compressor bands provide an accurate & controlled compression Versatile plier & band clip design allows them to be used parallel or perpedicular to the cylinder block Self-adjusting ratcheting plier has fine locking increments which provide accurate ring adjustment to the band 6 low profile bands & multi-angle control pliers allow easy use in confined areas such as motorbikes & machinery Bands reduce ring movement keeping the ring in the correct position whilst compressing Fits pistons 73 to 111mmresistance