User Guide:   * Choose a sutiable size drill bit depend on the woods' hardness level:   -  If the wood is a soft one, choose a relatively one size smller drill bit;  -  If the wood is a hard one, choose an exact size or a relatively one size larger drill bit;  * Choose a Sutiable Size Drill Bit Depend on the Diameter of the Screw:   -  5/64" bit can drill a hole(hole diameter is 2mm) for screws whose diameter is 2.2-2.8mm;  -  7/64" bit can drill a hole(hole diameter is 2.8mm) for screws whose diameter is 3-3.5mm;  -  9/64" bit can drill a hole(hole diameter is 3.5mm) for screws whose diameter is 4-4.5mm;  -  11/64" bit can drill a hole(hole diameter is 4.5mm) for screws whose diameter is 5-5.5mm;  -  5mm bit can drill a hole(hole diameter is 5mm) for screws whose diameter is 5.5-6mm;  -  13/64" bit can drill a hole(hole diameter is 5.2mm) for screws whose diameter is 6-6.5mm;  -  1/4" bit can drill a hole(hole diameter is 6.35mm) for screws whose diameter is 7-7.5mm;  * What if the drill bit get stucked:   -  If the drill bit get stuck and jammed after drilling and you are not able to pull it out, use the L-Shape Wrench to disassemble the drill bit into parts, then you can get the bit out.  What You Will Get:

• FEATURE: Self centering function enhances accuracy and efficiency. The 2 holes design on the head of brass shell made sawdust discharged faster
• MATERIAL: Made of high speed steel; heat treated twice, which made bits harder and had excellent wear resistance
• IMPORTANT: Choose a low drill speed (2000R/min - 3000R/min is suggested)when drilling; If the speed is too fast, drill bit may fail to self centering, even get snapped or stucked
• SIZE: 5/64", 7/64", two 9/64", 11/64", 5mm, 13/64", 1/4", total 8 PCS self-centering hinge drill bits, all are 1/4" hex shank
• WIDE USAGE: Ideal for woodworking; installing hinges for door, window, cabinet, etc
• More User Guidence please see the <Product Description> below B0CG4KWYW8