Description:  4Pcs Professional Doors Self Centering Hinge Hardware Drill Bit Set.      Specifications:  Material: Brass, High-speed Steel;  Appearance: electroplating;  Type: Core Drill Bit;  specifications: 5/64'',  7/64'', 9/64'', 11/64'';  Color: Silver;  Weight: 110G;  Quantity: 4pcs;  Scope: professional drilling tool,applicable to the installation of door hinge;     Features:  Please adjust the hardness of the wood under , if the wood is soft, choose a smaller size , if the wood is hard , you can choose a larger size or  corresponding opening tool.  Precise positioning, will not shift , sawdust will be automatically discharged from the top of the drill holes on both sides , not stuck drill Unique design , perfect punch effect , helpful for professional and DIY persons.     Package Included:  1 Pc x 5/64'' Tapper;  1 Pc x 7/64'' Tapper;  1 Pc x 9/64'' Tapper;  1 Pc x 11/64'' Tapper