http://www.beadaholique.com/yt - This video shows you how to use a wire gauge tool to determine the thickness of the wire you are working with. Very easy to use and handy to have around. The tool not only shows the gauge but also its corresponding mm size.
You can find the supplies in this video at Beadaholique.com:
Stainless Steel Wire Gauge - Measures Both Standard And Metric SKU: XTL-0159 http://www.beadaholique.com/p-35232-stainless-steel-wire-gauge-measures-both-standard-and-metric.aspx?utm_source=YouTube&utm_medium=social-media&utm_campaign=default
Antiqued Brass Open Eye Pins 21 Gauge 2 Inch SKU: FHP-6281 http://www.beadaholique.com/p-22768-antiqued-brass-open-eye-pins-21-gauge-2-inch-x50.aspx?utm_source=YouTube&utm_medium=social-media&utm_campaign=default
Beadalon Large Beading Mats - Prevent Bead Rolling 13 X 18 Inch SKU: XTL-9935 http://www.beadaholique.com/p-25483-beadalon-large-beading-mats-prevent-bead-rolling-13-x-18-inch-set-of-2.aspx?utm_source=YouTube&utm_medium=social-media&utm_campaign=default