Solid carbide center drills provide excellent wear resistance when machining the toughest materials, such as cast iron and stainless steel. Center drills with a plain tip are the standard choice for creating center holes in a piece of stock to prepare it for turning between centers on a lathe.Center drills consist of a pilot drill and a countersink. They are used to create holes at the center of a piece of stock so it can be turned between centers on a lathe in metalworking applications. The pilot drill creates a small hole in the stock and the countersink expands the hole, leaving a small gap at the bottom of the hole that helps protect the lathe's centers from damage when the stock is turned on it. Specifications: Item: Center DrillCountersink Style: PlainMaterial - Machining: CarbideFinish - Machining: Bright (Uncoated)Countersink Angle: 60 DegreesCutting Direction - Machining: Right HandMeasurement System: MetricDrill Size: 4mmDrill Point Dia.: 4mmOverall Length: 10mmTrade Size: Long"