Specification Brand : Ddyspan BulletPoint1 : 1. Center and spotting drills are traditionally used to make a conical hole for a lathe center in order to make a starting point for a standard twist drill, designed to prevent the twist drill from walking. BulletPoint2 : 2. Used for producing center holds in components or work pieces with require machining between centers. ItemName : Ddyspan HSS 6542 Center Drill Bits 1.0-6mm Sprial Flute Drill Bits 60 Degree Wood Metal Bits Hole Frilling Hole Cutter,3.5mm ItemTypeKeyword : long-length-drill-bits Manufacturer : Ddyspan PartNumber : Ddyspan9956759432320 ProductDescription : Specification: