[Size] Internal Diameter: 3.2 mm / 0.13', Outer Diameter: 7 mm / 0.28', Length: 5 mm / 0.2'. Unthreaded. [Application] It is used to Keep Boards in Consistent Height and Prevent the Joint from Bending, Twisting, and Short-circuiting with middle Partition Design. Fit for 3D Printer, TV Wall Mounting, Electrical Outlet, Pegboard, Robot, Motorbike, Truck, Drone, Fpv, Quadcopter, Computer, Shutters Locks. [Durable and Reliable] Insulated ABS, Strong and Reliable, Easy to Install, and Durable to Use. [Feature] These spacers have advantages over the metal spacer. They are lighter, do not rust, and are less brittle, also widely used in electrical products. [Package Content] 250(+/-2%) x Black ABS Round Spacers