This 18g threadless labret post can be worn with your favorite threadless-style tops.0.5mm; Compatible with 0.45mm Threadless ShaftsFeaturing a 2.5mm flat disc, the labret post is made from high-quality titanium.The threadless style allows you to switch up your look with ease and comfort.18 gauge solid titanium. Available in a number of different lengths and colors.How to Use Threadless Jewelry:Threadless jewelry uses tension between the end and the shaft to fit and stay together. The end has an insertion pin which is slightly bent when inserted into a straight shaft. This slight bend of the pin against the straight shaft creates a spring tension, holding the end securely in place.Follow the instructions below to secure the threadless end into the threadless shaft Insert the pin one-third to halfway into the shaft. Hand-bend slightly the insertion pin against the shaft. Push the end into the shaft and test the fit. Adjusting the Fit: If it is too tight, take some of the bend out of the pin and try again. Remember, adjust slightly and then try again.