Review on Speder 136pcs Rivet Nut Tool Kit - Rivnut Tool Set with Wrench, Threaded Insert, and Nutsert - M6/M3/M4/M5/M8 for Furniture, Decoration, Car, Trailer, Boat, and More by David Stewart

Two broken bolts got stuck in my car frame and I couldn't reach the welded nut in the frame. I pierced the screws, used 2 different types of screw extractors, used a lot of heat, nothing came out of these broken screws. Finally, I drilled a hole big enough to put the rivet nut in (meaning I drilled much larger holes than the bolts themselves and made a bigger hole in my frame). This wonderful tool solved a problem I've been trying to solve for hours. I should have started with that. Highly recommended