Features: Overall quenching, high hardness, not easy to break. 90-degree inner chamfer opening, good edge sharpness and strength, 80% less resistance than traditional technology, not easy to block. Punch Drill: Punching dia.: 2.5mm / 0.1"; punching length: 21mm / 0.83"; shank dia.: 11mm / 0.43"; total length: 65mm / 2.56".
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