All surfaces are finely to scratches on pistons, rings, or cylinder wall during installation, protecting engine cores components with smooth operations General compatibility covers gasolines / oils engines, motorcycles, cars, SUVs, light / heavy trucks, and small construction equipment for efficient piston rings installation and removal Crafted from premium stainless steel, the piston rings compressors feature thickened high carbon steel construction with quenching for excellent rigidity and deformation resistance during engine repairs Simplified installation process requires without additional tools the coordinated use of compressors and pliers significantly reduces piston installation difficulty and improves engine maintenance efficiency This 3 piece piston rings compressor set includes 3 inch, 4 inch, and 6 inch compressors with an adjustable piston installation plier, suitable for engines ranging from small motorcycles to heavy trucks and construction machinery, Manufacturer: Hrtyvhin