Features: * Used for grinder saw blade with different angle. * Suitable for circular saws. * Package includes 7 pieces of saw bushing, size includes 16-25.4mm, 16-22mm, 16-20mm, 20-25.4mm, 20-22mm, 22-25.4mm, 25.4-30mm.* Durable and long service life. Specifications: Product Name: Circular Saw Ring Material: Metal Size: (Approx.) Inner Diameter: 16mm Outer Diameter: 25.4mm Inner Diameter: 16mm Outer Diameter: 22mm Inner Diameter: 16mm Outer Diameter: 20mm Inner Diameter: 20mm Outer Diameter: 25.4mm Inner Diameter: 20mm outer diameter: 22mm inner diameter: 22mm outer diameter: 25.4mm inner diameter: 25.4mm outer diameter: 30mm Color: silver Suitable for: circular saws Quantity: 7pcs/set Package content: 7pcs/set circular saw ring Note: 1. Passage: 1cm = 10mm = 0.39 inch.2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3. Please allow slight manual measurement deviation for the data.