Features: brand new and high quality Flexibility of coupling shaft removes stress between the motor and driving components. Great workmanship, with strict quality control and quality assurance, high safety factor, can be used with peace of mind. Made of high-quality high speed steel materials, strong and durable. This sleeve installed on the grinding mill, and can be sanding disc polishing grinding. We offer 6 kinds types optional, you can choose one or more according to your needs. Specifications: Material: High Speed Steel Hole Diameter: 5mm/6mm/8mm/10mm/12mm/14mm(10mm=0.39'') Type: 5mm to M10/6mm to M10/8mm to M10/10mm to M10/12mm to M10/14mm to M10 Package Includes: 1x Saw Blade Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.