About this item 【SELF CENTERING】Would you feel trouble by reason that the drill could not precise position easily during working? No worries! Designed with 135° split point, BOEN drill bit set features the characteristics of preventing walking and cuts stainless steel more fasterly. The handle is straight and round, which means that the high-speed drill can be compatible with all kinds of equipment. 【Convenient Spiral Groove】 A spiral groove design of drill bit set can quickly remove particles while working, reduce friction and heat, thereby improving drilling performance. With it, your powerful machine can easily do DIY, home maintenance, repairs, and more. 【Superior Material】M35 high-speed drill is durable, safe and eco-friendly. The 5% cobalt content extends the tool life and ensures higher heat resistance of the drill. Compared with ordinary drill, it is not only for good performance but also for more important thing--high efficiency! 【13 Mutiple - Sizes】This 13 PCS Drill Bit Set size includes: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4". Additionally, the drill bit iron box and holder with size index allow you to conveniently store and take your needed size! 【Wide Applicability】M35 cobalt drill bits can be widely uesd in metal working, not suitable for glass or ceramic. A perfect ideal for cutting hard alloys such as stainless steel and cast iron. NOTE: keep the drill bit vertical with the stuff's surface to be drilled.