^NEW!!! A31-275 Genuine Rivnuts. These are quality fasteners made of aluminum. The slotted flaps allow the even distribution of work loads over a large area. Rivnuts are ideal for the installation of seat belts, car top carriers, and mirror mounts. Specifications include: 5/16-18 threads, .409" barrel diameter, .665 head diameter, .062" thick, .937" +/- .015" length, grip range of .200"-.275", and requires a "Z" drill (.414"-.423") pilot hole. Listing is for 10 pieces. Save and combine shipping with other purchases from gracies_stuff!