1. Piston Installer Pliers: Tool set for compressing piston rings for cylinder installation, fine tooth lock allows you to compress bands in small increments, universal fit for cars. 2. Application: Piston ring compressor tool can be tightened to fit any pistion from 2‑7/8in (73mm) to 4‑3/8in (111mm) in diameter, please check before ordering. 3. Pliers Unique Design: The ring compressor pliers feature a ratcheting lock to hold the handles in position for easy piston installation. 4. Material: Made of high strength metal material, which is wear resistant, bend proof, high hardness, impact resistant and has long service life. 5. Storage Box: Pack includes heavy duty carrying case with handle for easy transportation, safe storage, and quick organization, and prevents parts from getting lost. Specification: Item Type: Piston Ring Compressor Set Material: Metal Application: Universal fit 6 Band size 2-7/8-Inch thru 3-1/8-Inch 3-1/8-Inch thru 3-3/8-Inch 3-3/8-Inch thru 3-5/8-Inch 3-5/8-Inch thru 3-7/8-Inch 3-7/8-Inch thru 4-1/8-Inch 4-1/8-Inch thru 4-3/8-Inch packing list: 1 xPiston Ring Compressor 6 x Accessory 1 x Box