Mandrel & Nosepiece Kit 1/4-20 Thread Set

Mandrel and nosepiece set for 1/4-20 UNC rivet nuts designed to work with the RN-1 / 39300 rivet nut setter tool. It enables correct installation of 1/4-20 size inserts by matching thread and nosepiece, ensuring the rivet nut pulls and forms properly, especially when dealing with sheet metal panels where back access is limited.