These Industrial Silver & Deming Drill Bits have a 135 Degree Split Point Tip for faster penetration and more accurate starts. They’re also made of high quality HSS material. They have been treated with a black and gold surface treatment to hold lubricant for smoother drilling. They also feature a Tri-Flat Shank for solid gripping. Each of the 17 HSS bits has its size etched into the base of the bit for easy to avoid mixing them up. This set also includes an aluminum storage case with labeled bit organizer and holder. Each HSS Bit is Permanently Etched with its Size Includes Aluminum Storage Case with Size Labeled Hard Foam Drill Bit Holder 135 Degree & Split Point For Faster Penetration and More Accurate Start Setting Points Tri-Flat Sure-Grip 1/2” Shanks on all 17 Bits Bit Sizes Include: 1/2", 17/32”, 9/16”, 19/32”, 5/8”, 21/32”, 11/16”, 23/32”, 3/4”, 25/32”, 13/16”, 27/32”, 7/8”, 29/32”, 15/16”, 31/32” and 1”.