Feature: Wide usage: The grinding discs are suitable for non-metallic and non-hard materials, and they are mainly applied for wood trimming, root carving, tea plate, peeling, chamfering, trimming and deburring, polishing, manual DIY, etc. Specifications: Size: Outer diameter: 100 mm/ 4 inch Inner bore diameter: 16 mm/ 5/8 inch Material: carbon steel Color: as pictures show Package contents: 1 x Circular wood carving grinding disc 1 x Flat grinder shaping abrasive disc 1 x Bevel wood carving grinding disc Warm notice: Please allow slight errors on size due to manual measurement.  The colors shown on picture may be biased from the true color, please refer the real objects. Please keep it out of the range of children.