Features: 1. Made of carbon steel material with special process treatment. 2. Easy to operate and easy to clean. 3. It is used for for installing and dismounting the piston ring. Description: Nickel-plated surface and rubber coated handle make it comfortable and durable. Specifications: Color: Red + silver Material: carbon steel Size: small: about 40mm-100mm/1.57-3.94in medium: about 80mm-120mm/3.15-4.72in large: about 110mm-160mm/4.33-6.30in Package Included: 1 * Powerful Piston Ring Expander