No teeth, light spring, box joint.A precision tool that will keep on weaving for millions of rings.electrically discharging handles - dissipative. Max Recommended Wire Thickness (*See Notes Above): Stainless and Titanium (SS/TI): 16g Copper (CU): 12g Bronze and Brass (BZ/BJR): 16g Aluminum (anodized AA and bright AB): 12g Minimum Recommended Size (*See Notes Above): 20g