These drill bits are manufactured from drop forged, high speed steel with a titanium coating which providesfaster, smoother & cleaner cuts. They can be used to obtain the proper depth needed for any applicationin plumbing or woodworking. A nylon bag is supplied for storage. Set includes:-1 Pc 15 Step Bit (4-32mm) 1 Pc 9 Step Bit (4-20mm) 1 Pc 8 Step Bit (4-12mm) Quick Change Hex Shank (for use in any drill or drill press) BARCODE 5017403 078586