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Self centering drill bit: Color: silver Material: Brass + high-speed steel Appearance: Electroplating Type: Core Drill Bit Quantity: 7 pieces Dimensions: 5/64 ",7/64",9/64 ",11/64",13/64 ",5 mm,1/4" It is a set of professional drilling tools,applicable to the installation of the door hinge. Usage instruction. Feature: The 7/64" is good replacement for drilling holes in smaller hinges and hardware like decorative boxes. The 9/64" is ideal replacement for medium to full size hinges and hardware. The 11/64 is perfect replacement for door hinges,gate locks and all large hardware. The bits are surrounded by spring loaded guides that have a window to show the drill bit depth while making adjustments. They come in the 3 most common hinge screw sizes 7/64",9/64",11/64". Automatic Center Punch Quick and easy to use,it delivers an automatic spring-driven strike when it's pressed against a surface. An adjustable cap allows you to regulate the striking force. The premium brass body has a deeply knurled nonslip surface replacement for sure handling and control. Package Include: 1 x Automatic Center Punch 7X Center drill bit