[Precise Size] Reduction rings measure 20x12.75x1.1mm, engineered for accurate fitting between saw blades and tool arbors. [Tool Compatibility] Compatible with circular saw blades, cutting discs, and other power cutting tools requiring size adjustment. [Function] Ensures secure mounting of blades, reduces vibration during operation, and improves cutting precision and stability. [Durable Material] Made of metal for strength, wear resistance, and long-lasting performance under heavy-duty use. [Easy Installation] Includes 20 reduction rings, lightweight and simple to install, providing multiple replacements for extended tool life., Manufacturer: EMSea