Item Description:These self centering drill bits put hinges right where they should be in the center.4 of the most often used sizes for carpenters, cabinet, furniture makers and other wood working trades.Easy to use and install.Positioning accuracy, will not shift, the chips will automatic discharge from the hole on either side of theof the drill, not stuck drill.SpecificationsMaterial: Brass + HSSColor: SilverSize: 5/64inch: Hole diameter is about 2mm, Use about 2.2 - 2.8mm tapping screw7/64inch: Hole diameter is about 2.8mm, Use about 3 - 3.5mm tapping screw9/64inch: Hole diameter is about 3.5mm, Use about 4 - 4.5mm tapping screw11/64inch: Hole diameter is about 4.5mm, Use about 5 - 5.5mm tapping screwIncluded: 1 x 4Pcs HSS Self Centering Hinge Drill Bit SetItem Specification:DIY Supplies: WoodworkingType: Twist Drill Bitlength: as shownUse: Metal Drillingis_customized: YesMaterial: Carbide