Specification: Item Type: Ball Grinding Head Material: C45 Steel Colour: Black Applicable Machine: For 100/115/125 angle grinder. Package List: 1 x Ball Grinding Head Feature: 1. 40MM GROOVE: Quick and efficient, this ball file can easily grind a groove with 40mm diameter, ideal for wooden materials. 2. EXQUISITE WORKMANSHIP: Black spray paint and fine polishing treatment make the incisive edge has high cutting efficiency. 3. C45 STEEL: Having been through quenching treatment, this ball grinding head made of C45 steel is wear resistant and durable. 4. WIDE APPLICATION: Ideal for 100, 115 or 125 angle grinders, widely applied in small and medium engraving processing operation. 5. EASY INSTALLATION: Compact in size and light in weight, the convenient installation will largely save both your time and effort.