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Shop Counterbore
Drill America DEWCBR Series Qualtech High-Speed Steel Counterbore, 5/8" Shank Diameter, 1/4" Pilot, 5-3/8" Length, 13/16" Size (Pack of 1)
$35.76
Amazon.com
Accusize Industrial Tools H.S.S. Solid Cap Screw Counterbore Set, 3 Flute, Straight Shank, 7 Pc, 508S-0007
$67.42
Amazon.com
5pcs Counterbore Drill Bits Set, 4 Flutes Straight End Mill Cutter HSS Countersink Slot End Mill Cutter M3-M8 for Copper Aluminum Cast Iron
$20.02
Amazon.com
Counterbore
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In machining, a counterbore is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature.
Wikipedia
Symbol
:
⌴'
