sparkfun DEV-16138 Hook-Up Manual page 5

Required Tools
You will need a soldering iron, solder, and general soldering accessories to solder the header pins to the Qwiic
shields:
Soldering Iron - 30W (US, 110V)
 TOL-09507
Suggested Reading
If you aren't familiar with the Qwiic system, we recommend reading here for an overview:
We would also recommend taking a look at the following tutorials if you aren't familiar with them:
How to Solder: Through-Hole Soldering
This tutorial covers everything you need to know about
through-hole soldering.
Solder Lead Free - 15-gram Tube
 TOL-09163
Qwiic Connect System
Arduino Shields
All things Arduino Shields. What they are and how to
assemble them.