The [1/4-inch core hex handle self centered hinge practice is made of High-quality materials for doors and windows, but can also be used for drilling aluminum, copper, stainless steel, and other metal door and window hinges. Perfect for drilling in hinges, hardware, or any time you need to accurately locate holes. The self centered drill tip of the is customized and can be opened more accurately with less eccentricity to help with correct and center seated hinges. Other: has a flat bottom. The universal 1/4inch HEX Shank is designed for a wide range of applications. It must be a center flight hole in various sizes. The self centered Clic Change Door hint drill bit set includes 9 VIX bits and 1 HEX key. The VIX bit models are 5/64inch, 7/64inch, 7/64inch, 9/64inch, 9/64inch, 11/64inch, 5MM, 13/64inch, 1/4inch. A complete set of custom matches, comprehensive, comprehensive, just in case. The brightly colored case is pleasant and easy to recognize. The Vix drill bit has a unique design and careful production, making it a good choice for DIY enthusiasts and professionals, whether for self use or as a gift. Before using it for the first time, make sure to tighten the center drill bit. When you open the hole, please make appropriate adjustments based on the hardness of the wood. If the wood is loose and soft, you can choose smaller wood. If the wood is difficult, you can choose corresponding or larger wood. Material: Metal colour: Multicolor Package Contents: 9 x Self Centering Drill Bit(5/64inch, 7/64inch, 7/64inch, 9/64inch, 9/64inch, 11/64inch, 5MM, 13/64inch, 1/4inch) 1 x wrench