forum threadJohnDubya posted Jun 12, 2026 04:26 PM
Item 1 of 3
Item 1 of 3
forum threadJohnDubya posted Jun 12, 2026 04:26 PM
$72.20: Bosch CO21 21-Piece Assorted Set with Case Cobalt Metal Drill Bit, Three-Flat Shank
$72
$120
40% offAmazon
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I would stay away from something THIS expensive, for only 21 basic drill bits.
I would stay away from something THIS expensive, for only 21 basic drill bits.
you might not really need that 21 piece.
Figure - 3/16 is like $5 sold separately etc. 1/4" is $7. So unless you REALLY want to have that missing 11/64 in ($4.99 on Amazon) and the 13/16 in. ($6.76 on Amazon), you're really just buying doubles.
good sharp bits though. remember cobalt is sharp but not ductile. it doesn't like sharp shocks or hitting surprise metal in wood. or being used as a mill lol
21 piece contains:
two 1/16 in., two 5/64 in., one 3/32 in., one 7/64 in., two 1/8 in., one 9/64 in., one 5/32 in., one 11/64 in., two 3/16 in., one 13/64 in., one 7/32 in., one 15/64 in., two 1/4 in., one 5/16 in., one 3/8 in., one 1/2 in.
14 piece contains
one 1/16 in., one 5/64 in., one 3/32 in., one 7/64 in., two 1/8 in., one 9/64 in., one 5/32 in., one 3/16 in., one 7/32 in., one 1/4 in., one 5/16 in., one 3/8 in., one 1/2 in.
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