Heavy Metal Crochet Work – Tip #1 Studio Deanna 11 years ago 16 Gauge Colored Copper Wire moving into 20 Gauge. Heavy Metal start to the Spur Mahogany tree trunk. Using a USK/10.5 crochet hook, 6.5MM. Wire Crochet Tip #1 – Take several breaks as you work the wire to reduce the chance of stress injuries!