> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/duo-build/structure/intro/15mm-x-30mm-extrusion.md).

# 15mm x 30mm Extrusion

## 15mm x 30mm Extrusion Basics

![](/files/-MBkHv0cdzJI1d3ZFvrA)

The 15mm x 30mm profile of the [Extrusion](https://www.revrobotics.com/ftc/structure/15mm-extrusion/) has slots on on all four sides that accept standard[ M3 hardware](https://www.revrobotics.com/ftc/hardware/fasteners/). Rather than using a T-nut, which is more expensive,  slide a M3 hex head screw along the slot and adjust brackets and other build materials as needed. As illustrated in the image above, the ends of the Extrusion also have a 5mm hole **pitch** that can be M3 tappped. The 15mm x 30mm Extrusion has one slot on each 15mm face and 3 slots on each 30mm face, allowing for some additional design flexibility when compared to the standard 15mm extrusion.  

{% hint style="info" %}
*To learn more about extrusion systems versus pitch systems return to the* [*Structure Page*](/duo-build/structure/intro.md)*.*
{% endhint %}

### Product Specs 

* Material: 6063 Aluminum, clear or black anodized 
* Height: 15mm
* Width: 30mm
* Length: [1m](https://www.revrobotics.com/15mmx30mm-extrusion/) or [420mm](https://www.revrobotics.com/rev-41-1587/)
  * Extrusion can be cut to shorter lengths as needed

## When to Use?

The 15mm x 30mm Extrusion is great for areas where more torsional strength is needed in an application than the standard 15mm Extrusion. 

{% hint style="info" %}
**Torsional Strength** is a measure of the ability of a material to withstand a twisting load.

*To learn more about why torsional strength is helpful to your robot design visit the* [*constraining motion*](/duo-build/building/constraining-motion.md) *page* 
{% endhint %}

## How to Use?

The point of the extrusion system is to offer more flexibility in design than would come in a fixed pitch system. The slots in the extrusion allow brackets and other components to be slid along the 15mm Extrusion to an infinite number of positions. 

![](/files/-M94znMlvqQj5puBupVE)