The OEMTOOLS 25039 Piston Ring Compressor is crafted for automotive professionals and enthusiasts who demand precision, durability, and versatility in their tools. This compressor's adjustable size fits pistons from 3-1/2 to 7 inches, making it a versatile addition to any toolkit. The high-grade spring steel construction ensures longevity, while the beaded edge design prevents the compressor from entering the cylinder during piston installation, ensuring a smooth operation. With features like double friction brake adjustment and a hardened tool ratchet, this compressor streamlines the piston installation process, saving time and enhancing efficiency. The inclusion of a 1/4 inch square drive adjuster tool in the kit ensures you have everything needed for effective piston ring compression. Whether you're involved in engine rebuilding or repair, the OEMTOOLS 25039 Piston Ring Compressor stands as a testament to the blend of innovation and reliability that professionals and enthusiasts expect.