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These drill bits are manufactured from drop-forged, high-speed steel with a titanium coating which provides faster, smoother & cleaner cuts. They can be used to obtain the proper depth needed for any application in 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); ¼” Quick Change Hex Shank (for use in any drill or drill press) Product SKU ST-HD-DB152 x 1