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    7 Products
    About Drill Bits
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    Compare material, finish, length class, and decimal size equivalents.

    Hole-Enlarging Reduced-Shank Drill Bits

    Image of Product. Front orientation. Drill Bits. Hole-Enlarging Reduced-Shank Drill Bits.
    A simple way to enlarge an existing drilled hole, these bits are an economical alternative to reamers. They have four flutes that won’t catch on the inside of the hole like standard two-flute bits can, avoiding damage to the hole and your tool. The shank has a smaller diameter than the cutting tip, so you can ream large holes using tools that have standard-size chucks.
    Gold Oxide—Like black oxide, this finish adds wear resistance and reduces friction for improved chip flow. Because it’s less prone to flaking off, it offers better rust protection when bits aren't in use.
    Drill Bit
    Size
    Overall
    Lg.
    Max. Drilling
    Dp.
    Shank Type
    Each
     
    Gold Oxide
    3/8"
    		4.31"1.75"Reduced Round
    		30455A61000000
    1/2"
    		4.31"1.75"Reduced Round
    		30455A6200000
    9/16"
    		4.31"1.75"Reduced Round
    		30455A6300000
    5/8"
    		4.31"1.75"Reduced Round
    		30455A6400000
    11/16"
    		4.31"1.75"Reduced Round
    		30455A6500000
    3/4"
    		4.31"1.75"Reduced Round
    		30455A6600000
     

    Hole-Enlarging Reduced-Shank Drill Bit Sets

    Image of Product. Front orientation. Drill Bits. Hole-Enlarging Reduced-Shank Drill Bit Sets.
    An economical alternative to reamers, these sets include four bit sizes for enlarging existing drilled holes. Bits have four flutes that won’t catch on the inside of the hole like standard two-flute bits can, avoiding damage to the hole and your tool. The shank has a smaller diameter than the cutting tip, so you can ream large holes using tools that have small-capacity chucks. Sets also contain four hole-starting bits.
    Gold Oxide—Like black oxide, this finish adds wear resistance and reduces friction for improved chip flow. Because it’s less prone to flaking off, it offers better rust protection when bits aren't in use.
    No. of
    Pieces
    Drill Bit Sizes Included
    System of
    Measurement
    Container
    Type
    Each
    Gold Oxide
    81/4", 5/16", 25/64", and 15/32" Hole-Starting Bits,
    3/8", 1/2", 5/8", and 3/4" Hole-Enlarging Bits    		InchMetal Case30455A710000000
     
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