This is a set of 6pcs Center Drill Bits. Center drill bits are used to drill a conical hole for a lathe center in order to make a starting point for a standard drill so as to prevent the drill from walking. Center drill bits are also used for producing center holds in components or work-pieces with required machining between centers. Features - ColorSilver - Material: High-speed steel. - Size: 10x10x3cm. - Center drill bit is made of , with extremely , low consumption and durable with impact resistance, wear resistance. - 4 Difference Sizes: Drill tip diameter size of center drill bits including 1.0/2.0/2.5/5.0mm. - Center drill bits can be used to make conical holes for a lathe center in order to make a starting point for a standard drill, designed to prevent the drill from walking, as well as for producing center holds in components or work pieces with require machining between centers. Package list: 1 x set of 4Pcs 1.0/2.0/2.5/5.0mm Hand Tap Drill Center Drills Bit Hand Tools