Features: - Used for grinder saw with different angle. - Suitable for circular saws. - 2 pcs saw bushing, optional size 20-16mm, 25.4-20mm, 30-16mm, 30-20mm, 30-25.4mm. - Durable and long service life. Specifications: Product Name: Circular Saw Ring Material: Metal Optional Type: 20-16mm, 25.4-20mm, 30-16mm, 30-20mm, 30-25.4mm Size: (Approx.) Inner Diameter: 16mm Outer Diameter: 20mm Inner Diameter: 16mm Diameter outer: 30mm Inner diameter: 20mm Outer diameter: 25.4mm Inner diameter: 20mm Outer diameter: 30mm Inner diameter: 25.4mm Outer diameter: 30mm Color: Silver Suitable for: circular saws Quantity: 2 pcs Package content: 2 pcs Circular saw ring Note: 1. Transition: 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.