Description:  7pcs Self Centering Door Window Hinge Set Twist Wood Drill Bit Hole Puncher.     Specification:  Material:Brass shell, high-speed steel core;  Sizes:5/64", 7/64", 9/64", 11/64", 5mm, 13/64", 1/4";  Hole Size:  5/64":The hole diameter is approximately 2mm, using a 2.2-2.8mm tapping screw;  7/64":The diameter of the opening is approximately 2.8mm, and a 3-3.5mm tapping screw is used;  9/64":diameter of opening is approximately 3.5mm, use 4-4.5mm self-tapping screws;  11/64":diameter of opening is approximately 4.5mm, use 5-5.5mm self-tapping screws;  5mm:opening diameter is 5mm, use 5.5-6mm self-tapping screws;  13/64":The diameter of the hole is approximately 5.2mm, using a 6-6.5mm tapping screw;  1/4":opening diameter of about 6.35mm, using 7-7.5mm tapping screws;  Quantity:7pcs/set;     Features:  -Positioning accuracy, will not shift, wood chips will be automatically discharged from the hole on both sides of the top of the drill bit, will not block the drill bit.  -The door and window hinges are fixed to the doors and windows by screws. This product is used to open the holes in the hinge screw holes of the doors and windows.  -The drill sleeve can hold the position well and ensure the precision of drilling, which is a good tool for improving the drilling efficiency      How to use: When opening the hole, please adjust according to the hardness of the wood.  If the wood is soft, you can choose the smaller one.  If the wood is hard, you can choose the corresponding or bigger one.     Notice:  1. Please allow a bit error due to manual measurement. please make sure you do not mind before you bid.  2. The color may have different as the difference display, pls understand.     Package Included: 1 x Drill Bit Set (7pcs)