Installs pistons 3-1/2" to 7" (89mm - 177mm) in diameter
Has 4 tension bands
Bands are made of spring steel
Beaded along the lower edge to prevent compressor from entering the cylinder
The 6-1/2" high positive lock compressor has 4 tension bands and compresses diesels upper and lower rings. It's used to install pistons on trucks and tractors with specific diameters. This has the quality and durability you can depend on!