Check the listing for details. 20PACK Wire Threaded Inserts 1/4-20 UNC 2D 12.7mm Steel Helical Coiled Sleeve. Condition: New. Listed at 10.91 USD. 304 Stainless Steel Helical Threaded InsertsGeneral Information：[1]Note - When the installation amount is small, take the corresponding bolts + nuts, fix the thread insert on the screw and fix it with the same type of nut to make the three in one. Use a wrench to screw the threaded insert into the bottom hole and remove the screw.[2]Material - 304 stainless steel has good corrosion resistance, rust prevention, high hardness, and excellent oxidation resistance. It is austenitic stainless steel, which is non-magnetic or slightly magnetic.[3]Features - Designed with a certain of elastic, and provides an even load. Wire thread inserts have self-tapping capability without pre-tapping the base metal. Large contact surface with finished products, strong tensile force. Strong resistance to vibration, no deformation.