Don't let a loose hose fitting blow an O-ring and not have the proper tools and parts to fix it. The serious diver is always prepared to nip a dive aborting problem occur. That's just one scenario that this kit can remedy. This kit comes in zippered pouch and includes 2 specially developed Scuba Wrenches (wrenches have 4 sizes which fit most regulator 1st stage hose attachments), high quality crescent wrench, Phillips head and flat head screw drivers, 8 piece hex wrench set, needle nose pliers, professional o-ring tool, 8 tie wraps, 1/4 oz. jar silicone grease, and 10 piece o-ring kit.