Features:* These self-centering bits place hinges where they should be centered.* The 7 most commonly used sizes for carpenters, cabinet makers, furniture makers and other woodworking professions.* Easy to use and install.* Positioning accuracy, no moves, the chips will automatically discharge from the hole on both sides of the top of the drill, not the drill. Specifications: Product Name: Self-Centering Hinged Drill Bits Material: Brass Coating, Fast Core Steel Drill Bits, Surface Electroplating Size: 5/64 Inch, 7/64 Inch, 9/64 Inch, 11/64 Inch, 5mm, 13/64 Inch, 1/4 Inch Color: Black, Orange, Yellow, Green, Cyan-Blue, Blue, Purple Suitable for: Door Hole and Swing Hinge Quantity: 7pcs/set Package Content: 7 Self-Centering Hinge Drills Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.