80 90 mm Circular Saw Blade Metal Saw Cutting Blade Disc Blades Rotary Tool. Special For Steel / Special For Aluminum. Outer Diameter : 80 / 90 mm Bore :22 /25.4/ 27 mm. Package includes: According to your choice. Please select a size and quantity pack from the drop down options above. About merchandise: For our store functional products, we ensure that the function is the same as the description, but due to technical improvements and manufacturing differences, the actual color and shape may be slightly different from the pictures.