Assorted Reusable Silicone Caps and Plugs - Prevent powder build-up in critical tolerance areas like threaded holes, studs and more. Silicone caps and plugs are reuseable because cured powder rolls right off. This kit includes over 150 caps and over 150 plugs. Caps range in size from.040in.ID to.295in.ID. Plugs range in size from.062in. to.896in. diameter. Reuseable storage boxes included. Made in the USA.