I have been carrying a full size case sodbuster everyday for years and I love the quality of the steel. I bought a "tactical" knife from a guy at work and the ease of opening was nice however, the edge holding sucked, it would take a good edge it just wouldn't last. I carried it as well as my case for about three weeks and I flicked it open one time and the blade flew off. I'm looking for recommendations on something with at least a four inch blade that will lock up tight with no wiggle that can cut stuff, scrape gaskets, loosen the occasional screw and will hold an edge. I'm willing to spend $100.00 and will consider saving for longer if additional money is necessary. I work in places wear firearm carry (at least by law abiding citizens) is forbidden.