[Size]-6mm(0.24inch) outer diameter 3mm(0.12inch) inner diameter 1mm. Used for pipe, pipe nut, valve or other garden maintenance or modification. It can prevent pipeline leakage and provide positive closure, prevent leakage to save energy. Nylon, wear-resistant, anti-corrosion, waterproof and insulating. Please confirm the required size and material to purchase, and place them in a suitable place. Color: Black Material: Nylon Package Contents: 5000 * Nylon Flat Washer Only the above package content, other products are not included. Note: Light shooting 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 +/- 1-3 cm.