(50) 11/32" X 7/16" High Temp Silicone Rubber Tapered Stopper Plugs for Powder Coating Custom Painting Masking Supplies Bottom diameter: .343" - Top diameter: .437" - Length: .687" 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.