Note: Please select the appropriate size according to your needs. This 8-piece set is made from tough aluminum and measures 10.5mm inside diameter, 20mm outside diameter, and 12mm in length. They're compatible with M10 screws or 2/5-inch bolts, so they'll fit right into your project. The black finish looks slick, and the material is corrosion-resistant, conducts electricity well, and holds up under pressure Instruction Easy to use, just need to install on the screw bolts with proper diameter. M3x40mm Aluminum Spacer Columns For RC Drones 10 Pack M3x40mm Aluminum Standoff Spacers - Black Hexagonal RC Drone Parts Aluminum Spacers M10 Aluminum Spacers, 12 Pcs Metal Spacers Aluminum 10.5mm ID X 20mm OD X 15mm L Aluminum Spacer Screw Standoff Round For 3 8 Or M10 Screw Bolts 4b305e2c A5d8 488f 9205 A74a36702814.f6bd7f5e916af5ab2a2ca0cc3825d0bf Application: This Aluminum spacer can be widely used in high-temperature, high-pressure, and highly corrosive pressure, valves, sealing parts of cylinder heads, and industries such as car, steel mills, chemical equipment, and engineering machinery. Choose From Our Selection Of Metric Spacers, Including Unthreaded Spacers, Threaded Standoffs, And More. Same And Next Day Delivery Advantage: Made of durable Aluminum material, which is hard, good performance, good electrical conductivity, corrosion resistance and can be used for a long time. Material: Aluminum; Color: Silver; Size:10., 5mm ID x 20mm OD x 10mm L / 0., 41*0., 79*0., 39 inch;