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Design allows for drilling, tapping, deburring and countersinking in steel, copper, brass, aluminum and plastic Constructed out of hardened and tempered M2 High Speed Steel for long life, Premium Swift Bore (Registered Trademark) 135-degree split point for accurate self centering, drills exact size hole for tapping Tapered design beyond tap prevents thread damage from excess drilling Set includes: 6-32NC, 8-32NC, 10-24NC, 10-32NF, 12-24NC, 1/4-inch--20NC combo drill/taps and 2-inch #2 Phillips and slotted power bits