Features: Brand new and high quality There are 11pieces, outer diameters are 20mm/22mm/25.4mm/30mm/32mm, meeting your different demands. Made of stainless steel, anti-rust and strong, can last for a long for time. Can be used in combination with rotary tools for cutting metal, wood, plastic, etc. Used for saw blade for different angle grinder. Precision reamed for maximum safety. Allows blades to be used on different tools as needed. Specifications: Material：Stainless Steel Diameters:(11pcs) Outer 20mm Inner 16mm， Outer 22mm Inner 16mm, Outer 25.4mm Inner 22mm, Outer 25.4mm Inner 16mm, Outer 25.4mm Inner 20mm， Outer 22mm Inner 20mm, Outer 30mm Inner 25.4mm, Outer 32mm Inner 16mm, Outer 32mm Inner 20mm, Outer 32mm Inner 22mm, Outer 32mm Inner 25.4mm Package Includes: 11 Pieces Saw Blade Reducting Rings note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.