This aluminum spacer can be widely used in industries such as high temperature, high pressure, high corrosion pressure, valve, cylinder head seal parts, and other industries such as automotive, steel manufacturing, chemical equipment, engineering machinery, etc. Specifications Material: Aluminum Color: Silver Size: 6.2mm Inner Diameter x 15mm Outer Diameter x 1.5mm Compatible Screw Size: 1/4" M6 Screws Features: Made of durable aluminum material, hard, excellent performance, good electrical conductivity, corrosion resistance, can be used for a long time. Instructions: Easy to use, just attach to the appropriate diameter screw. ATTENTION PLEASE CHOOSE THE RIGHT SIZE IF YOU NEED