Create strong threads in wood and plastic that won’t get clogged during finishing processes. These inserts have a silicone plug that blocks out paint, coatings, and debris—and won’t melt when exposed to heat. The flange has four prongs that grip the surrounding material to help prevent twisting.

For wood, install the inserts in a drilled hole at any time. For plastic, install them before injection molding. Once finishing is complete, pop the plug out by threading your fastener through the insert or just peel it off.