50 Piece 1/4" ID High Temp Silicone Rubber End Caps - Powder Coating, Painting, Plating, Blasting Protection Internal diameter: .234", External diameter: .360", Usable length: 1.00" Flexible, durable and reusable. Withstands heat up to 600 degrees Fahrenheit/315 Celsius. Use for powder coating, painting, plating, anodizing, media blasting, etc. Premium quality silicone will not crack, shrink, harden or break.