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Best Single End Countersinks

M.A.FORD 4 Piece Single Flute (Uniflute) Countersink Sets - Included Angle: 82 Degress
Steam homo surface treatment (blackening) to prolong tool life and prevent galling.
Reviews
"I've ran the crap out of these on mild steel for work with minimal lube and they have held up."
"As advertised."
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KEO 53518 Cobalt Steel Single-End Countersink Set, Uncoated (Bright) Finish, 82 Degree Point Angle, 5/16" - 5/8" Head Diameter
Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys.
Reviews
"These work GREAT!"
"Definitely glad I upgraded to cobalt steel countersinks."
"Finally found this set of quality cobalt steel countrrsinks for metal and wood."
".5 Star deduction for me having to de-burr the cutting edge with a small roll of fine sandpaper."
"I user these on aluminum plate to countersink a bunch of screw holes and they work fantastic."
"Very well made and effective."
"My feelings are KEO- If you cant spend 5 extra minutes to take burs off and make sure the cutting edges are sharp, I will find someone who will. In fact this is why I wanted a set from Keo- to have a nice sharp set that I could use and I got basically the same thing as the inexpensive chinese set my friend has. If Keo had cared, they would have asked me to send them in, offered to send me a set that was checked and double checked,\. and then --when receiving the set I sent them, would have done whatever to correct."
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Morse Cutting Tools 25613 Zero Flute Countersink, M42 8% Cobalt, Bright Finish, 82 degree Point, #3 Size
For countersinking and deburring in a wide range of ferrous and non-ferrous materials.
Reviews
"Excellent countersink."
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Best Double End Countersinks

Magafor 414 Series Cobalt Steel Double-End Countersink, Uncoated (Bright) Finish, Zero Flute, 82 Degrees, 0.25" Shank Diameter, 0.25" Body Diameter
With more than 250 ranges and 8 000 dimensions, MAGAFOR offers the solution adapted to your machining.
Reviews
"Wow, these really do cut clean edges."
"product exactly as described, very fast ship, Thank You."
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Best Combined Drill Countersinks

Magafor S115 5 Piece, 2 Flute, 60 Degrees Cutting Angle High-Speed Steel Uncoated (Bright) Combination Center Drill And Countersink Bit Set With Double End
With more than 250 ranges and 8 000 dimensions, MAGAFOR offers the solution adapted to your machining.
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