Knurled Brass Threaded Insert 3/8″ x 16 TPI 5 Piece

Achieve strong, secure mounting for your custom bottle stoppers with this 5-piece set of Knurled Brass Threaded Inserts. Designed for use with stainless steel bottle stopper hardware, each insert features crisp 3/8″ x 16 TPI threading and a knurled exterior that provides superior grip inside your turned wooden or acrylic blank. These inserts ensure a dependable, long-lasting hold—essential for bottle stoppers that will be used frequently. Whether you’re turning gifts, stocking craft show inventory, or producing premium stopper designs, these inserts deliver the strength and reliability needed for professional results.