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Features: 100% brand new and high quality. Unique ladder structure , it can open multiple aperture. It can not easily be broken. It can deburr, chamfer and open hole, but ordinary twist drill can't. Little rock, it can carve out a nice aperture without firstly using a center punch. Tool using: pistol drill, bench drill. Water to make ti cool while working, it can effectively extend the service life. Recommended drilling speed 250--400 rpm. Suit for use in hardness under 25° artifacts,The plate thickness under 5mm. Package Included: 1pc HSS 4241 spiral groove step drill