The DEWALT diamond drill bit performs according to your standards so you never have to worry about being let down by an important tool. This bit is diamond welded for durability, and a reverse spiral thread delivers continuous water speed, increasing the life of the bit and maximizing speed and efficiency on the job. For large, repetitious projects, a core ejection slot removes plugs, saving you time and energy. This bit is perfect for kitchen and bath installation, residential and commercial plumbing, and a range of other applications.