This product includes 2 pieces of TCT Cutting Disc Conversion Ring with the following specifications -- 20x16mm , 25.4x20mm , 30x16mm , 30x20mm , 30x25.4mm , 5pcs set Effortless Installation -- Simply insert the saw blade into the speed reducer ring and secure it in place, enabling quick and easy setup for immediate usability. Versatile Compatibility -- This bushing is suitable for use with saw blades, marble blade bore conversion, angle grinders, and various cutting machines, providing you with versatile application options. Precision-Engineered Durability -- The Saw blade reducer bushing is crafted from high-grade stainless steel, ensuring long-lasting performance and optimal alignment for precise, balanced cutting. Efficient Performance -- Designed for optimal cutting efficiency, this bushing reduces the time and effort required to achieve precise cuts, making your work smoother and faster., Weight: 0.110231131 Pounds, Manufacturer: GOHAPY