Like New. The OTC 4830 Piston Ring Compressor Set with Ring Expander is a specialized automotive hand tool designed by the trusted brand OTC. This set includes a piston ring compressor with an included ring expander, making it convenient for mechanics and car enthusiasts to use. The product also comes with a California Prop 65 Warning due to the presence of chemicals that may pose a risk to reproductive health. This tool set is essential for properly compressing and expanding piston rings during automotive maintenance and repair.