Overview
Designed for Small Components and Electronic Devices.This mobile kit helps you work on an enormous range of small screws, including those found on:
laptops and other computers / controllers and consoles / cell phones and various / smart devices / electronic components on vehicles and equipment / small appliances
cameras / access control hardware / radio-controlled vehicles / personal items like eyeglasses and watches
Precise Tip Geometry and Stamped Markings
Tekton 4 mm bits are made with tight tolerances for a secure fit in small screws, reducing slip and wear—crucial for high-value, sensitive electronics.
The tip size and Tekton "T" are clearly stamped onto every bit.

Hardened Bits with Non-Flaking Protective Finish
The bits are made from hardened 8660 steel (55–58 HRC)* and finished with a zinc phosphate conversion coating that provides lasting corrosion resistance without altering dimensions or flaking, unlike chrome finishes.
* Line Head bits are made of hardened AISI 1015 steel (40 HRC)
Modular Bit Organization
Bits are grouped in logical 12-piece sets across 8 modular rails. The rails can be removed or rearranged within the case.
Bit Rails Have a Soft, Secure Hold
The flexible rails securely grip the bits so they can’t fall out, while also making it easy to remove any bit one-handed. The rails can also stand upright on a flat surface, making the markings easier to see.
High-contrast size markings are printed on the top of the rail.
Smooth-Spinning Magnetic Driver
Keep the bit engaged by pressing on the end cap while spinning the driver body. A recessed magnet holds and magnetizes the bit.

Aluminum Bit Driver
The driver body and endcap are machined from aluminum and finished with a black anodized coating.
Top Lid Parts Tray
Room for Your Fingers
Open Slots for Most Used Bits
TContoured Inset EVA Foam
3-Layered Case Material
Zippered Closure