The self centering drill bit set consists of three different specifications of drill bits, 3/32inch, 7/64inch, 1/8inch, made of high-speed steel, high hardness and wear resistance, with one hexagonal wrenche, can meet the needs of daily life. Note: Please confirm the model you need before purchasing. 1/4-inch hexagon shank can be adapted to various chuck sizes. You can also unscrew the screw with a hex wrench and simply replace the drill bit if the bit is worn, which ensures sustainable use of the self centering drill bit. The unique carbon steel housing and spring design enables self centering function, reducing drilling deviation and greatly improving drilling accuracy and safety. The two-opening design of the carbon steel housing also improves the smoothness of chip removal. Self Centering Hinge Drill Bit is especially suitable for the drilling of furniture such as doors and Windows. It can be used for the drilling of wood and some metals. Note: Please do not drill hard metal for a long time to avoid damaging the drill bit. Color: As Shown Material: Metal Package Contents: 1set * self centering drill bit