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    Cobalt Jobbers - Letter Sizes


    Cobalt Jobbers contain a percentage of Cobalt in their steel, greatly increasing their wear resistance.
    shank size is the same as the diameter of the drill
    Part #
    Price
    COBA
    • #A
    • 0.234000"
    • 2-5/8"
    • 3-7/8"
    $6.86
    COBB
    • #B
    • 0.238000"
    • 2-3/4"
    • 4"
    $7.26
    COBC
    • #C
    • 0.242000"
    • 2-3/4"
    • 4"
    $7.26
    COBD
    • #D
    • 0.246000"
    • 2-3/4"
    • 4"
    $7.26
    COBE
    • #E
    • 0.250000"
    • 2-3/4"
    • 4"
    $6.18
    COBF
    • #F
    • 0.257000"
    • 2-7/8"
    • 4-1/8"
    $8.22
    COBG
    • #G
    • 0.261000"
    • 2-7/8"
    • 4-1/8"
    $8.22
    COBH
    • #H
    • 0.266000"
    • 2-7/8"
    • 4-1/8"
    $8.62
    COBI
    • #I
    • 0.272000"
    • 2-7/8"
    • 4-1/8"
    $8.62
    COBJ
    • #J
    • 0.277000"
    • 2-7/8"
    • 4-1/8"
    $8.62
    COBK
    • #K
    • 0.281100"
    • 2-15/16"
    • 4-1/4"
    $8.62
    COBL
    • #L
    • 0.290000"
    • 2-15/16"
    • 4-1/4"
    $10.29
    COBM
    • #M
    • 0.295000"
    • 3-1/16"
    • 4-3/8"
    $10.29
    COBN
    • #N
    • 0.302000"
    • 3-1/16"
    • 4-3/8"
    $11.02
    COBO
    • #O
    • 0.316000"
    • 3-3/16"
    • 4-1/2"
    $11.58
    COBP
    • #P
    • 0.323000"
    • 3-5/16"
    • 4-5/8"
    $11.58
    COBQ
    • #Q
    • 0.332000"
    • 3-7/16"
    • 4-3/4"
    $12.98
    COBR
    • #R
    • 0.339000"
    • 3-7/16"
    • 4-3/4"
    $12.98
    COBS
    • #S
    • 0.348000"
    • 3-1/2"
    • 4-7/8"
    $16.42
    COBT
    • #T
    • 0.358000"
    • 3-1/2"
    • 4-3/8"
    $16.42
    COBU
    • #U
    • 0.368000"
    • 3-5/8"
    • 5"
    $16.42
    COBV
    • #V
    • 0.377000"
    • 3-5/8"
    • 5"
    $16.53
    COBW
    • #W
    • 0.386000"
    • 3-3/4"
    • 5-1/8"
    $16.53
    COBX
    • #X
    • 0.397000"
    • 3-3/4"
    • 5-1/8"
    $16.53
    COBY
    • #Y
    • 0.404000"
    • 3-7/8"
    • 5-1/4"
    $18.52
    COBZ
    • #Z
    • 0.413000"
    • 3-7/8"
    • 5-1/4"
    $20.14
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