All the advantages of the LF series, but even better! The large flange on these Rivet-Nuts disguises common application flaws such as out of round or oversized holes. Axial knurls allow for better hole fill & significantly reduces spinning. LFK Rivet-Nuts offer the highest values for torque strength, pull out & push through. Knurls are designed to work in soft materials such as nylon, fiberglass, plastic, etc.