No teeth, light spring, lap jointThese are really tiny and great for mico-maille. Not recommended for larger than 19g rings - but this is personal preference.Longer version of the 475Made in USA Max Recommended Wire Thickness (*See Notes Above): Stainless and Titanium (SS/TI): 20gCopper (CU): 18gBronze and Brass (BZ/BJR): 20gAluminum (anodized AA and bright AB): 18g Minimum Recommended Size (*See Notes Above): 24g