2.5mm slot and modelling DIY drill bit

A 2.5 mm drill bit designed for slot and model workshops

When working on the preparation of a slot car or in the construction of a model kit, precision is not optional: it is the starting point. The TT722 drill bit from Tectime, with a diameter of 2.5 mm, covers that working range where most hand drills, mini drills, and bench rotary tools are most frequently used on the hobbyist's workbench.

Function and application

The diameter of 2.5 mm is one of the most demanded in slot and model workshops. It is commonly used for:

• Opening and adjusting housings in plastic or resin chassis.
• Preparing pilot holes before enlarging with larger diameter drill bits.
• General DIY work on small parts of static models, figures, and dioramas.
• Touch-ups and corrections on bodies or structural elements of slot cars.

Main features

• Diameter: 2.5 mm.
• Reference: TT722.
• Brand: Tectime.
• Suitable for use with mini drills, rotary tools, and common benchtop drill presses in the hobby.

Ideal for…

This drill bit is aimed at both the slot car preparer who needs a reliable tool for specific interventions on the chassis or body, and the modeller who works with static models and dioramas and requires clean and controlled holes in plastic or resin materials. It is also useful for any precision DIY task on the workbench.

Recommended mounting and use

Before drilling, always mark the entry point with a punch or centre to prevent the drill bit from wandering on smooth surfaces. Work at medium-low speeds on plastic to avoid melting the material, and advance with gentle and constant pressure. If you reuse the drill bit over several sessions, check the cutting edge: a small diameter drill bit dulls more quickly than larger ones and can break if forced while in poor condition.

Frequently asked questions

What type of machine can I use this drill bit with?

It is compatible with the mini drills and rotary tools commonly used in modelling (such as Dremel or similar), as well as with benchtop drill presses used in the hobby. Ensure that your tool's chuck accommodates 2.5 mm shanks or adapt with a precision chuck if necessary.

What materials is it suitable for?

It is suitable for plastic, resin, and soft materials commonly found in chassis, bodies, and model parts. We do not have information on its performance with hard metals, so we cannot guarantee results for that use.

Can it be used to enlarge existing holes?

Yes, although to enlarge a previous hole, it is advisable that the diameter difference is small and that the starting hole is perfectly centred. If the original hole is off-centre, the drill bit will tend to follow the deviation rather than correct it.

How often should a drill bit of this diameter be replaced?

It depends on the volume of work and the material. Small diameter drill bits are more delicate than larger ones: if you notice that it requires more pressure than usual or that the cutting edge no longer enters cleanly, it is time to replace it. Having a spare in the drawer is always a good idea.

The Tectime TT722 is a 2.5 mm drill bit designed for slot car preparation, static model kits, and general hobby workshop use. Compatible with standard rotary tools and benchtop drill presses, it delivers controlled, clean drilling in plastic and resin components. A reliable everyday tool for slot car builders, scale modellers, and diorama enthusiasts.

Information not available

We have been unable to verify data on the manufacturing material of the drill bit (HSS, carbide, etc.) or on the total length or cutting length. If you need this data for your specific application, we recommend consulting us before placing your order.