High-Quality Material: This industrial powder coating kit is made of silicone rubber, ensuring robustness, corrosion resistance, and a tight seal. It's designed to resist cracking and withstand high temperatures up to 200-300°C. Package Quantity: The rubber stoppers set includes 110 pieces in 8 different sizes, ranging from 1/16 inch to 5/8 inch. Available in red, black, yellow, and blue, suitable for various hole sizes. Plastic Box Packaging: The tapered hole plugs are packed in a plastic box, divided by size for convenient use and storage. Wide Range of Applications: These solid rubber stoppers are used for hole plugging, spraying, coating, and paint protection. They are widely used to block transmission, brake, and vacuum lines and ports in chemical, machinery, construction, or laboratory settings. Color: As shown Material: Silica Size: 17.60x9.91x2.59 cm Package Contents: 110 * Silicone Plugs, conical (5 red 20x25mm, 5 blue 17x25mm, 5 blue 14x25mm, 10 blue 12x17.5mm, 10 yellow 9.5x19mm, 15 black 6.5x19mm, 25 red 8.7x16mm, 35 red 4.7x16mm)