The Koken 3/8" Drive Bit Holder allows 5/16" (8mm) hex bits to be used with standard 3/8" drive ratchets and socket tools.
This adaptor expands tool versatility by enabling larger hex bits to be driven using socket wrenches, making it suitable for automotive, mechanical and workshop fastening tasks.
Manufactured in Japan with Koken’s renowned precision engineering, this bit holder delivers secure bit retention and reliable torque transfer for professional workshop environments. Industrial Shed supplies trusted tools built for demanding trade applications.
Product Type: Bit Holder Adapter
Brand: Koken
Drive Size: 3/8" Drive
Bit Size: 5/16" (8mm) Hex
Part Number: KO3138
Application: Screwdriver bit fastening with socket tools
► Key Features
‣ Converts 3/8" drive tools to accept 5/16" hex bits
‣ Secure bit holding design
‣ Suitable for larger hex driver bits
‣ Precision-machined adaptor construction
‣ Professional Japanese Koken tool quality
► Why Tradies and Contractors Buy This
‣ Expands socket tool compatibility
‣ Ideal for workshop and automotive use
‣ Reliable bit retention and torque transfer
‣ Trusted Koken engineering precision
‣ Professional adaptor supplied by Industrial Shed
► Stock won’t last — get yours now at Industrial Shed!
At Industrial Shed, we know you need your gear fast and without the runaround. Here’s what makes our shipping better:
Local Delivery, Done In-House: If you're on the Mornington Peninsula, we handle delivery ourselves—no middlemen, no delays. Get your tools the same day or next day, straight from our team to your door.
Nationwide Reach, Reliable Partners: Need it shipped across Australia? We work with top couriers to offer standard and express options, so you get your order when you need it.
Track Every Step: You’ll get a tracking number the moment your order ships. No guessing—just a clear view of where your delivery’s at.
Service with a Real Human Touch: Got special delivery needs? Give us a shout. We’re here to make it happen, no fuss.
With Industrial Shed, you're not just another package in the mail. We get your order to you fast, safe, and with the reliability you expect.
For more information, visit Shipping Details: The Essentials.
At Industrial Shed, we keep things simple. If something’s not right or you’re not satisfied, we’ll sort it out—fast and easy.
What Sets Us Apart?
Fast Turnaround: We don’t mess around. When you need to return an item, we process it quickly so you’re not left waiting. Our goal is to get your refund or exchange sorted fast so you can get back to work.
Local Touch: For customers on the Mornington Peninsula, we offer the added benefit of in-store returns for quicker resolution. No shipping hassles—just bring it back to us, and we’ll handle the rest.
No-Nonsense Support: We make returns and refunds straightforward. If there’s a problem, you won’t be stuck in endless back-and-forths. We’re hands-on and get it sorted with minimal hassle.
Clear Policies, No Surprises: We believe in being upfront. Our return and refund policy is clear, so you know exactly what’s covered—whether it’s warranty claims, special orders, or regular returns. You’ll never be left guessing.
Built for Tradies: We understand the demands of the job, so we’re all about making returns and refunds simple, quick, and no fuss—because downtime is the last thing you need.
For more information, visit Returns & Refunds: Straight Talk.
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