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Size: 5/64":Hole diameter is about 2 mm,Use about 2.2 - 2.8 mm tapping screw 7/64":Hole diameter is about 2.8 mm,Use about 3 - 3.5 mm tapping screw 9/64":Hole diameter is about 3.5mm,Use about 4 - 4.5 mm tapping screw 11/64":Hole diameter is about 4.5mm,Use about 5 - 5.5 mm tapping screw
Use Method: Please appropriate adjustments according to the hardness of wood when opening,if wooden cottage,you can choose a smaller size,if hard wood,choose corresponding or a bigger size.
Package include: 4x Wood drill bit tools
Material: Brass + HSS, Surface plating
Avoid splitting out hardwoods by pre-drilling your screw holes
Positioning accuracy,will not shift,the chips will automatic discharge from the hole on either side of the top of the drill,not stuck drill.
Works equally well nn metal, wood or plastic,a great helper for wood DIY and engineering use