4pcs HSS Self Centering Hinge Drill Bit Set for Hinges Drawer GuidesFeatures1. These self centering drill bits put hinges right where they should be in the center.2. The 4 most common sizes used by carpenters, cabinetmakers, furniture makers and other carpentry trades.3. Easy to use and install.4. 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.