High-quality material: The round screw spacer is made of high-quality material, which has good temperature resistance, oil resistance, resistance and tear resistance, and long service life.<br> 14 sizes: 40 pieces 3x7x3; 20 pieces 3x7x5; 20 pieces 3x7x6; 20 pieces 3x7x8; 20 pieces 3x7x10; 20 pieces 3x7x12; 20 pieces 3x7x15; 40 pieces 4x7x3; 20 pieces 4x7x5; 20 pieces 4x7x6; 20 pieces 4x7x8; 20 pieces 4x7x10; 20 pieces 4x7x12; 20 pieces 4x7x15. A total of 320 pieces, suitable for most screws.<br> These spacers are , rust-, stable and insulating. Simply measure the length needed for the screws and choose the appropriate spacer shorter than the screws to allow the board to sit flush with the wall.<br> Wide range of applications: suitable for micro-motors, automobile manufacturing parts, electronic products, instruments, machinery, stationery, automation equipment, toys, hardware accessories, etc., widely used to protect LEDs on circuit boards.<br> Material: nylon<br> colour: black<br> Package Contents:<br> 160 x M3 isolation columns(40 x 3 mm, 5/6/8/10/12/15mm each 20)<br> 160 x isolation columns(40 x 3 mm, 5/6/8/10/12/15mm each 20)<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.