High quality self-centering hole drill

Name: Door and window hinge, hinge hole opening tool
 Material: Brass shell, high-speed steel drill core, external plating
Product specifications: 5/64 '', 7/64 '', 9/64 '', 11/64 '', 5mm, 13/64 '', 1/4 ''
Hole size: 5/64 '': The diameter of the hole is about 2mm, using self-tapping screws around 2.2-2.8mm
 7/64 '': The diameter of the hole is about 2.8mm, use about 3-3.5mm self-tapping screws
  9/64 '': The diameter of the hole is about 3.5mm, use about 4-4.5mm self-tapping screws
 11/64 '': The diameter of the hole is about 4.5mm, using self-tapping screws of about 5-5.5mm
5mm: The diameter of the hole is 5mm, use about 5.5-6mm self-tapping screws
13/64 '': The diameter of the opening is about 5.2mm, and the self-tapping screws around 6-6.5mm are used
1/4 '': The diameter of the hole is about 6.35mm, use self-tapping screws around 7-7.5mm
How to use: Please adjust appropriately according to the hardness of the wood when opening the hole. If the wood is soft, you can choose the smaller one, if the wood is hard, you can choose the corresponding or larger one.
Product features: precise positioning, no displacement, wood chips will be automatically discharged from the holes on both sides of the top of the drill bit, and the drill bit will not be stuck. The door and window hinges are fixed to the doors and windows by screws. This product is used to open the screw holes of the door and window hinges. The drill sleeve can fix the position well, ensure the accuracy of the drilling, and is a good tool to improve the punching efficiency of the coach!