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  1. Edgeprep

    best drill material for drilling hardened high strength steel??

    I work for Conicity Technologies and we put the edge prep on tools the way they are being used. On your drill we would put .003-.004 in the center and maybe .0015 to the corner leaving it sharp so there is no rubbinb. Both flutes will be exactly the same and it cuts around it's own center line...

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