Features:100% quality and Brand new.Material HSSColor :Silver ToneHigh Speed SteelStandard 60 degree included angleprecision importdouble endedSpecification:This listing is for a set of 5 HSS Center DrillsIt includes 1 each of sizes #1， #2， #3， #4 and #5Each drill has a double end and is ground with a standard 60 degree included angleThe set includes 1 each of the following sizes:#1 with 3mm body diameter & 1mm drill tip diameter#2 with 4mm body diameter & 1.5mm drill tip diameter#3 with 6mm body diameter & 2.5mm drill tip diameter#4 with 8mm body diameter & 3.15 drill tip diameter#5 with 12mm body diameter & 5mm drill tip diameterUsage: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 walkingUsed for producing center holds in components or work pieces with require machining between centersPackage Included:1x a set of 5 HSS Center Drills