Made of silicone material, it not crack, shrink, harden or crack, is non- and harmless, and can be reused. Withstands temperatures up to 600 degrees Fahrenheit/315 degrees Celsius. For hole coverage in powder coating, painting, plating, and sandblasting. Widely used in construction, electronics, automobiles, machine workshops, laboratories, etc. The Taper Hole Plug Kit contains 105 pieces in 8 different sizes, packaged in a clear plastic box, and fit any threaded or unthreaded hole from 1/16inch to 5/8inch inside diameter. Colour:As Shown Material:Silica gel Size:5pcs red 20x17mm, 5pcs blue 17x13mm, 5pcs blue 14x9.5mm, 10pcs blue 12x8.7mm, 10pcs yellow 9.5x6.5mm, 15pcs red 8.7x4.7mm, 20pcs black 6.5x3mm, 35pcs rose red 4.7x1.6mm Package Contents: 105 x Silicone Rubber Tapered Plugs Only the above package content, other products are not included. 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.