Annular Cutter JESTUOUS 3/4 Inch Weldon Shank 7/16 Cutting Diameter 2 Cutting Depth with Pilot Pin Slugger Bits Two Flat HSS Kit for Magnetic Drill Press,1 Piece

If you want to drill (machine) clean and accurate holes into metal {+0.004", -0.000" in steel}, the annular cutters are the way to go. Anything over 3/8 of an inch starts getting difficult to bore, especially over 1/2". Twist bits have their purpose and their limitations too. When I was a young pup, I work in maintenance as an apprentice mill wright. I had to drill countless holes in iron for a truck scale. Holes up 1-1/8" with twist bits. Holes of that size were drilled in 3-4 stages, tedious process. Annular cutters @ any size will cut in one blow. A 1-1/8" diameter hole through 1" iron is about a 2 min approx. I own a magnetic drill that has the 3/4 inch Weldon Chuck on it, that is required for this cutter. I converted my production drill press to handle all my annular cutters. You need to have cutting fluid while boring. My press is 3/4 HP and variable speed on demand. Cutting speeds range from 600-1000rpm for 1/2" to 270-460rpm for 1-1/4". Personally, 1/2 HP is probably the smallest motor I would recommend. There is a lot of TORQUE involve while cutting. The item you are drilling "MUST BE" anchor to the drill press table!!! Otherwise, serious injury or more could happen. I am a serious DIY type person. Annular cutting IS NOT cheap. Once your friends {like me} found out that I can punch holes into 1-1/2" iron [2" cutter], I got more work than I want too. Now, these cutters ARE NOT sharpen easily. I have to send then off to a shop that can do it. They charge $30-35 per cutter. For the price I got these @, I just by new ones. My larger ones are costly, resharpen it about half of a new one. I have sizes from 7/16" to 1-3/8" Final Note: If you keep the cutters WELL lubricated and DO NOT over force them, you will get many of cuts.

Borrowed a magnetic drill to drill some holes in a truck frame. Only drilled a dozen holes but kept lubed with used oil and couldn't tell a difference from first hole to last. Worked great.

Held up good, drilled many holes in 1'' plate

Used to cut some holes in 3/8 thick steel. Worked well throgh the 16 holes we needed to drill, still seems quite sharp.

Sharpness and continued use with no problems .definitely recommend.

Works likebit should.

Used this to cut through the flange on some w4 13lb I beam. Cut it like it was butter. Will buy again if I need it

Dull after 1 hole. Absolute junk. Bought a replacement bit in a Evolution brand, and finished 50 holes with it.