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Eyech 4Pcs HSS Door Window Cabinet Self Centering Hinge Drill Bits Set Specifications: Color: silver Material: Brass + high-speed steel Appearance: Electroplating Dimensions: 5/64 ", 7/64", 9/64 ", 11/64" 5/64'': the opening diameter is about 2mm, using 2.2-2.8mm self tapping screw 7/64'': the opening diameter is about 2.8mm, using 3-3.5mm self tapping screw 9/64'': the opening diameter is about 3.5mm, using 4-4.5mm self tapping screw 11/64'': the opening diameter is about 4.5mm, using 5-5.5mm self tapping screw 5/64 ", 7/64" is good for drilling holes in smaller hinges and hardware like decorative boxes. 9/64" is ideal for medium to full size hinges and hardware. 11/64 is perfect for door hinges, gate locks and all large hardware. Usage instruction: Please adjust according to the hardness of the wood, if the wood is soft, choose a smaller size; If the wood is hard, you can choose a larger size or corresponding opening tool. We promise that if you are not satisfied with the product, we will return it 100% Package Includes: 4 pc Center drill bit