Check the listing for details. 50 Pcs Threaded Insert for Wood, 1/4" - 20 Threaded Studs 15mm Length, Silver. Condition: New. Listed at 16.76 USD. Description:1. [Material] Our threaded inserts are made of zinc plated carbon steel, which is finely crafted, has strong wear and corrosion resistance, is high strength,and has a long service life.2. [Function] Wood Thread Inserts are an insert nut that snaps into a pre-drilled hole in wood with internal threads. Our wood insert nuts feature a threaded design with external protrusions that bite into the wood, providing superior grip and preventing the insert nut from rotating or falling out in all applications.3. [Easy To Use] Equipped with a hexagonal wrench, just pre-drill a suitable hole, make sure the threaded insert is inserted vertically into the hole, and then screw it into the hole with a wrench. If the furniture wood is very hard, the hole diameter should be appropriately enlarged.4.