Features: 1. Various types: Applicable cylinder diameter: 19-64mm/0.75-2.52 inch, 32-89mm/1.26-3.50inch, 51-165mm/2.01-6.50inch,three types to choose from. 2. Main function: Remove carbon and hot glaze deposits on cylinder bores that may affect engine starting, effectively prolonging the service life of the engine. 3. Flexible Shaft: Controlled spring action and extended control limiter, help with quickest cutting action, help in quick transition from one cylinder to another. 4. Durable material: Made of metal steel material, high hardness, not easy to wear, strong pressure resistance, strong and durable. 5. Wide range of applications: It can be used for honing cylinders on automobiles, motorcycles, tractors, and industrial engines, and is easy to install or remove. Specification: Product Name: Adjustable Brake Cylinder Hone Piston Color: Black+Silver Material: Steel Size: About 19-64 mm/0.75-2.52 inch, 32-89 mm/1.26-3.50 inch, 51-165 mm/2.01-6.50 inch (applicable cylinder diameter) The package includes: 1Pc x Adjustable Brake Cylinder Hone Piston Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.