• Ko-ken 12 Piece Master 3/8" Square Drive Extension Set Front View
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Ko-ken 12 Piece Master 3/8" Square Drive Extension Set

$345
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SKU: KB-3760/12

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    Ko-ken 12 Piece Master 3/8" Square Drive Extension Set Front View

    Ko-ken 12 Piece Master 3/8" Square Drive Extension Set

    If you’re tired of “making it work” with the wrong extension length, this master set fixes that. You get 12 different 3/8" drive extension bars—from ultra-short 32mm all the way to a 1000mm (1 meter) reach—so you can clear obstacles, reach recessed fasteners, and keep your ratchet out of pinch points.
Ko-ken’s straight-profile extensions are built for a solid feel under load, with a knurled grip section that makes handling easier with oily gloves.

    What’s Included (12 Pieces)

    What’s Included (12 Pieces)

    • 3/8" Drive Extension Bars (Ko-ken 3760 Series)
    • 3760-32 (32mm)
    • 3760-50 (50mm)
    • 3760-75 (75mm)
    • 3760-100 (100mm)
    • 3760-125 (125mm)
    • 3760-150 (150mm)
    • 3760-200 (200mm)
    • 3760-250 (250mm)
    • 3760-300 (300mm)
    • 3760-375 (375mm)
    • 3760-500 (500mm)
    • 3760-1000 (1000mm)

    Key Features

    12-length master set covers everything from tight-access to long-reach work
Straight profile for stable, predictable torque transfer
Knurled grip section for better handling with greasy hands or gloves
Pro-grade finish for durability and easy wipe-down

    Specs

    Spec

    Detail

    Drive Size

    3/8" square drive

    Type

    Extension bar set

    Pieces

    12

    Extension Length Range

    32mm to 1000mm

    Series

    Ko-ken 3760

    Why This Set Makes Sense

    Stops wasted time swapping between “almost right” lengths
Helps keep the ratchet away from hot/sharp areas while still staying on the fastener
Reduces sketchy combinations (multiple extensions stacked) when you just need one correct length

    Common Real-World Uses

    Reaching hardware behind guards, frames, and crossmembers
Deep fasteners on engine accessories, brackets, and housings
Getting past hoses/lines while keeping the socket square on the bolt head
Long-reach access for recessed fasteners without using wobble/universal joints when you don’t want angle

    FAQ

    Does this include wobble or locking extensions?

    No—this is a straight extension master set.

    Will this work with any 3/8" drive ratchet and sockets?

    Yes. Standard 3/8" square drive compatibility.

    Is this overkill if I already have a few extensions?

    If you do varied work (equipment, diesel, shop + field), having the exact length on hand saves time and frustration fast.