CRL Weldon Countersinks are known for their high quality unique designs and outstanding performance. They cut chatterless finished holes in aluminum every time. Smooth drilling action from a single cutting edge no matter what angle you cut at. The 1/4" (6 mm) shank diameter fits any 1/4" or 3/8" drill chuck.
Sizes for No. 6 to 16 Screws | Produce Smooth, Round Countersunk Holes Every Time | Best Countersinks Available for Aluminum
