A sawzall can finally live up to it's name and cut almost ANYTHING. You just need the right blade! Demonstration on hardened tool steel: [youtube]JDKiORlQ9rk[/youtube] Diablo - Steel Demon carbide-tipped blades. (Fairly new product... On the market for 2 years or so.) I used one of these last weekend to cut through the leaf spring eye bolts on my GMC Jimmy. Those bolts are 9/16" diameter, grade 8 (metric 10.9) plus the steel bushing insert. So... I was cutting something about 3/4" thick. Not a very fast cut but much quicker than using a 4.5" cut-off wheel. A couple of the teeth were wore down a little by the time I was done but it got the job done! Getting the sawzall into the right angle under the vehicle was the hardest part. After cutting through the eye bolt... I used it to chop the rear leaf shackle apart. I couldn't believe how fast this blade cut through the mild steel shackle. Scary fast! I remember attempting to use a sawzall to hack through the leaf spring shackle bolts in my Camaro several years ago... A futile attempt. A bi-metal blade just made smoke from the rubber bushing and polished a spot on the bolt. Available at Northern Tool and Home Depot... $11 for two of the 6" blades at Home Depot.