1 Step Big Looper Cuts & Loops 3mm. The 1 step Big Looper. Create and trim loops in one easy step! works with dead soft or half hard precious metal wire, craft wire, and copper or brass core wire. makes a consistent size 3mm loop every time. Bends and trims wire between 24 and 18 gauge wires. allows beaders to customize the length of eye pins. patent protected!