-Propeller nut inserts can be used in different applications including furniture, work benches, tables and displays. -Features a 1/4-20 thread. -The propeller nut can be gently inserted into many wood components and can also be used in hard plastic applications as well. -Produced from a reliable hardened steel that offers long-lasting quality when properly installed. -The propeller but offers excellent retention for blind applications such as levelers.